Category: To Do

  • Digital Printing

     

    THE PIXEL: A FUNDAMENTAL UNIT OF DIGITAL IMAGES

    Every digital image consists of a fundamental small-scale descriptor: THE PIXEL, invented by combining the words “PICture ELement.” Each pixel contains a series of numbers which describe its color or intensity. The precision to which a pixel can specify color is called its bit or color depth. The more pixels your image contains, the more detail it has the ability to describe (although more pixels alone don’t necessarily result in more detail; more on this later).

    PRINT SIZE: PIXELS PER INCH vs. DOTS PER INCH

    Since a pixel is just a unit of information, it is useless for describing real-world prints — unless you also specify their size. The terms pixels per inch (PPI) and dots per inch (DPI) were both introduced to relate this theoretical pixel unit to real-world visual resolution. These terms are often inaccurately interchanged — misleading the user about a device’s maximum print resolution (particularly with inkjet printers).

    “Pixels per inch” (PPI) is the more straightforward of the two terms. It describes just that: how many pixels an image contains per inch of distance (horizontally or vertically). PPI is also universal because it describes resolution in a way that doesn’t vary from device to device.

    “Dots per inch” (DPI) may seem deceptively simple at first, but the complication arises because multiple dots are often needed to create a single pixel — and this varies from device to device. In other words, a given DPI does not always lead to the same resolution. Using multiple dots to create each pixel is a process called “dithering.”

    Printers use dithering to create the appearance of more colors than they actually have. However, this trick comes at the expense of resolution, since dithering requires each pixel to be created from an even smaller pattern of dots. As a result, images will require more DPI than PPI in order to depict the same level of detail.

    In the above example, note how the dithered version is able to create the appearance of 128 pixel colors — even though it has far fewer dot colors (only 24). However, this result is only possible because each dot in the dithered image is much smaller than the pixels.

    The standard for prints done in a photo lab is about 300 PPI, but inkjet printers require several times this number of DPI (depending on the number of ink colors) for photographic quality. The required resolution also depends on the application; magazine and newspaper prints can get away with much less than 300 PPI.

    However, the more you try to enlarge a given image, the lower its PPI will become…

    MEGAPIXELS AND MAXIMUM PRINT SIZE

    A “megapixel” is simply a million pixels. If you require a certain resolution of detail (PPI), then there is a maximum print size you can achieve for a given number of megapixels. The following chart gives the maximum print sizes for several common camera megapixels.

    # of Megapixels Maximum 3:2 Print Size
    at 300 PPI: at 200 PPI:
    2 5.8″ x 3.8″ 8.7″ x 5.8″
    3 7.1″ x 4.7″ 10.6″ x 7.1″
    4 8.2″ x 5.4″ 12.2″ x 8.2″
    5 9.1″ x 6.1″ 13.7″ x 9.1″
    6 10.0″ x 6.7″ 15.0″ x 10.0″
    8 11.5″ x 7.7″ 17.3″ x 11.5″
    12 14.1″ x 9.4″ 21.2″ x 14.1″
    16 16.3″ x 10.9″ 24.5″ x 16.3″
    22 19.1″ x 12.8″ 28.7″ x 19.1″

    Note how a 2 megapixel camera cannot even make a standard 4×6 inch print at 300 PPI, whereas it requires a whopping 16 megapixels to make a 16×10 inch photo. This may be discouraging, but do not despair! Many will be happy with the sharpness provided by 200 PPI, although an even lower PPI may suffice if the viewing distance is large (see “Digital Photo Enlargement“). For example, most wall posters are often printed at less than 200 PPI, since it’s assumed that you won’t be inspecting them from 6 inches away.

    CAMERA & IMAGE ASPECT RATIO

    The print size calculations above assumed that the camera’s aspect ratio, or ratio of longest to shortest dimension, is the standard 3:2 used for 35 mm cameras. In fact, most compact cameras, monitors and TV screens have a 4:3 aspect ratio, while most digital SLR cameras are 3:2. Many other types exist though: some high end film equipment even use a 1:1 square image, and DVD movies are an elongated 16:9 ratio.

    This means that if your camera uses a 4:3 aspect ratio, but you need a 4 x 6 inch (3:2) print, then some of your megapixels will be wasted (11%). This should be considered if your camera has a different ratio than the desired print dimensions.

    Pixels themselves can also have their own aspect ratio, although this is less common. Certain video standards and earlier Nikon cameras have pixels with skewed dimensions.

    SENSOR SIZE: NOT ALL PIXELS ARE CREATED EQUAL

    Even if two cameras have the same number of pixels, it does not necessarily mean that the size of their pixels are also equal. The main distinguishing factor between a more expensive digital SLR and a compact camera is that the former has a much greater digital sensor area. This means that if both an SLR and a compact camera have the same number of pixels, the size of each pixel in the SLR camera will be much larger.

    Compact Camera Sensor
    SLR Camera Sensor

    Why does one care about how big the pixels are? A larger pixel has more light-gathering area, which means the light signal is stronger over a given interval of time.

    This usually results in an improved signal to noise ratio (SNR), which createsa smoother and more detailed image. Furthermore, the dynamic range of the images (range of light to dark which the camera can capture without becoming either black or clipping highlights) also increases with larger pixels. This is because each pixel well can contain more photons before it fills up and becomes completely white.

    The diagram below illustrates the relative size of several standard sensor sizes on the market today. Most digital SLR’s have either a 1.5X or 1.6X crop factor (compared to 35 mm film), although some high-end models actually have a digital sensor which has the same area as 35 mm. Sensor size labels given in inches do not reflect the actual diagonal size, but instead reflect the approximate diameter of the “imaging circle” (not fully utilized). Nevertheless, this number is in the specifications of most compact cameras.

    Why not just use the largest sensor possible? The main disadvantage of having a larger sensor is that they are much more expensive, so they are not always beneficial.

    Other factors are beyond the scope of this tutorial, however more can be read on the following points:larger sensors requiresmaller apertures in order to achieve the same depth of field, however they are alsoless susceptible to diffraction at a given aperture.

    Does all this mean it is bad to squeeze more pixels into the same sensor area? This will usually produce more noise, but only when viewed at 100% on your computer monitor. In an actual print, the higher megapixel model’s noise will be much more finely spaced — even though it appears noisier on screen (see “Image Noise: Frequency and Magnitude“). This advantage usually offsets any increase in noise when going to a larger megapixel model (with a few exceptions).

  • Print Quotes

    NOTE: To be completed. I want to take a practical course on digital printing with the Camera Club and study this in depth.

    If commercial print companies are used see image guidelines for each lab. Images need to be either JPEG or TIFF), with whatever colour profile is required by the printer (usually Adobe 1998 RGB or sRGB) at the specified resolution (usually 300 dpi) and at the exact dimensions required.

    The Task

    It’s not a requirement to submit prints for formal assessment, so you may choose to submit your work on the self-directed project in a different format, such as a book or a multi-media piece. However for the purposes of this exercise please imagine that you’re going to submit prints.
    1. Search the internet for different companies offering inkjet and C-type printing. Compile three quotes for getting your work professionally printed, with a variety of different options such as C-type or inkjet, for portfolio review. (The pictures don’t need to be framed or mounted.) Prices will be available on the companies’ websites. This kind of information is useful to inform your project proposal.
    2. Imagine you will order from one of these companies. Prepare one image file exactly as specified by the printers. Please note that you don’t actually need to have your work printed professionally in order to complete this exercise.
    3. Write a brief entry in your learning log, reflecting on whether or not you feel that an inkjet can be treated as a ‘photograph’.

    Different labs providing C-type printing use different machines and different brands of papers that will produce subtly different results and varying levels of quality. Some companies often offer postal services, such as sending test strips for you to assess, so you can instruct their technicians to make any adjustments to the exposure or colour balance before making the final print. They will then store the adjusted file for any future editions.

    Lower-end C-types can also be ordered online at a greatly reduced cost with fast turnaround times.

     

  • Lightroom Black and White

    Black and White landscapes

    Using built in profiles for quick different looks.
  • Create a Slideshow

    Task

    Look at some of the audio-visual slideshows on the websites listed above. Make some notes about particular works of interest, considering how they are edited, sequenced and how audio is used with images. Note down your own personal observations. (See Post Time-based audio-visual presentations)

    Whether or not you intend to present your photographs for Assignment Five as an audiovisual piece, suppose for this exercise that you will. Familiarise yourself with any basic slideshow – or video-making software and compile an edit of your work, experimenting with transitions, text and music and/or sound effects. Save your work so that your tutor and/or an assessor can view this if necessary. Write a brief evaluation of your work, commenting on how appropriate and effective you think this medium is for presenting your photographs.

    I was not able to complete this exercise because of RSI.

    I have used automated slideshows on both this blog and the zemniimages website as a way of showing many photos in sequence on journeys. See:

    I also did this type of automated slideshow for the Kyrgyzstan images:

    http://www.zemniimages.com/Photography/Documentary/Kyrgyzstan

    These all need more work on sequencing to control the impacts as automated slideshows. This is not so straightforward on SmugMug and requires a lot of clicking to deselect and reselect many images – and hence gives RSI. I need to do one page for each set of images, and am planning this for the summer when I have less professional computer work to do.

    I do a lot of simple video work in Lightroom and Adobe Premiere for work. The only one containing landscape photos is: 

    Maendeleo Yetu on You Tube (done quite quickly and still needs more editing)

    I am planning at some point to develop the colour images of Baizakh village as audio-visual presentations in Adobe Premiere. I would like to do something more complex with the Storm over T’ian Shen images in Adobe After Effects. But I get RSI if I do too much video work. So this will have to wait until I have a lot less other work. I also need to find suitable music – or compose my own in Adobe audition. I will be updating my skills in both Audition and Premiere this year for work. I will be developing skills in After Effects for my Illustration level 2 course.

     

  • Exhibitions and the White Cube

    Reflections on: Thomas McEvilley’s summary of O’Doherty’s 1976 series of articles for ArtForum in his introduction to O’Doherty, B (1999) Inside the White Cube: The Ideology of the Gallery Space University of California Press

    Traditionally the photograph has been considered in terms of a print, and the high point of recognition for a photographer being an exhibition of their prints in a Fine Art Gallery. Galleries may present very different types of space in terms of lighting conditions, amounts and shape of space and general ‘feel’. But a tendency has been to galleries presenting white ‘neutral’ space. However the apparent ‘neutrality’ of this space needs to be questioned in terms of the implicit meanings this imposes on the image and the presumed ’empty mind’ of the viewer.

    I would argue that a more interesting approach would be to acknowledge the importance of both context and the viewer’s life experience in giving meaning to the image, as valuable and integral parts of the art itself. This could mean displaying the same image in different conditions and explicitly promoting discussion of the ways that different life perspectives and everyday experiences of different viewers affect the meanings attributed. This could in turn lead photographers to discover ever more interesting perspectives and innovative approaches to their own work.

    For the moment I do not have the equipment or skills to produce for gallery exhibition.

    Summary of the article

    The main argument underlying the three articles is that the modernist gallery practice of placing artworks in a ‘White Cube’ places them in a sterile environment, depriving them of both connection to outside life and subjective meaning to the viewer, perpetuating the power of an art establishment elite.

    The first of O’Doherty’s articles equates the physical space of the White Cube – windows sealed off and white walls with ceiling lights –  to religious spaces and tombs designed to maintain particular social orders and power structures. ‘Art exists in a kind of eternity of display, and though there is lots of ‘period’ (late modern) there is no time. This eternity gives the gallery a limbolike status; one has to have died already to be there.’

    ‘The eternity suggested in our exhibition spaces is ostensibly that of artistic posterity, of underlying beauty, of the masterpiece. But in fact it is a specific sensibility, with specific limitations and conditions that is so glorified. By suggesting eternal ratification of a certain sensibility, the white cube suggests the eternal ratification of the claims of the caste or group sharing that sensibility. As a ritual place of meeting for members of that caste or group, it censors out the world of social variation, promoting a sense of the sole reality of its own point of view and, consequently, its endurance or eternal rightness. Seen thus, the endurance of a certain power structure is the end for which the sympathetic magic of the white cube is devised.’

    The second part of the article looks at what this institutionalisation for the spectator ‘In return for the glimpse of ersatz eternity that the white cube affords us – and as a token of our solidarity with the special interests of a group – we give up our humanness and become the cardboard Spectator with the disembodied Eye…tireless and above the vicissitudes of chance and change’ and its underpinnings in modernist aesthetics of formalism and abstraction in the search for ‘transcendence’.

    The final part of the article looks at the anti-formalist tradition that questioned and mocked the emptiness and meaninglessness of this white space.

    My reflections

    Both the original 1976 article and the 1999 book are now quite old, and have – as the end of the article suggests and also the anti-formalist tradition and critique of modernism – now become part of the ‘Canon’.

    In relation to photography, the exclusive dominance of the ‘White Cube’ as an aesthetic guardian never really existed – despite the authority of organisations like the Royal Photographic Society. Photography by its nature is copiable, and the wide availability of cheaper cameras has always made it less exclusive. Local camera clubs and their exhibitions have been popular for a very long time – few being able to replicate the ‘ideal gallery conditions’. Technological advances with digital software and the Internet and possibilities for mass self-publishing have significantly increased the production and dissemination options.

    There is nevertheless a continuing question of ‘quality’ and relationship of photography to the Fine Art world. There has been an expansion of private and public gallery spaces in large cities like London (eg but not only Photographer’s Gallery) where photography is displayed as ‘White Cube Fine Art’. Work of photographers is now commonly curated as Fine Art exhibitions in galleries like the Tate (See http://www.tate.org.uk/search?q=Photography), National Gallery (https://www.nationalgallery.org.uk/search?q=photographers),  and National Portrait Gallery. This inevitably raises issues of the power of the curator and the degree to which they promote or challenge established aesthetic ideas.

    In order to justify its display in a gallery such photography has to be ‘special’ – for example very large format images that can only be displayed in a gallery, abstraction or innovative use of traditional or digital techniques or drama in depiction of war and conflict. The gallery space and time is also inevitably a specific time that people set aside to visit a specific space – many after a long and expensive special journey. This means that certain norms of respect for the space and time of other visitors needs to be respected. Normally also the ’empty mind’ to absorb the ‘meaning of the works’ is seen as the ideal – together with reading of books etc on the photographer and work. This is true even of OCA Study visits.

    One way possible with photography would be to present prints of the same photograph in very different conditions and spaces as part of the same exhibition, or linked displays. Making the question of context an integral part.

    Another way to go beyond the ’empty mind’ approach (even in a White Cube gallery) would be not to replicate in photography the now somewhat cliche anti-formalist exhibitions, but to explicitly encourage the viewers to bring in and exchange ideas from their respective ‘outside worlds’. What does the same photograph, displayed in the same conditions mean to people with very different life experiences? That differential audience response – and even its day by day variation – is an integral part of the meaning. This would however need to go beyond the superficial recording of reactions in visitor’s books etc.

    Embracing rather than avoiding this diversity of contextual and audience meaning could lead to exciting new directions for photographers themselves. With the many digital processing options, different contextual effects could be mixed and explored to replicate or challenge them. The very different viewer responses could lead to further processing experiments and/or new images. This also opens up the possibility of more imaginative galleries themselves.

    We have also not yet seen the full effects of a move towards ‘virtual galleries’ that can (with virtual reality goggles) replicate the gallery experience – either a White Cube in one’s own home. Or infinite variations and user-generated interpretations.

     

  • Print on Demand

     

     

     

    Photobooks

     

     

    Whether or not you intend to produce a book to present your photographs for Assignment
    Five, suppose for this exercise that you will. During this exercise you’ll familiarise yourself
    with a print-on-demand application and experiment with a book design.You don’t need to place an order for the book for this exercise.

    If you don’t already have one, set up an account with a print-on-demand service, such as
    Blurb. (You don’t have to use Blurb, but whichever company you use must offer the option
    of saving your book layout draft as a pdf document.) You’ll need to download Blurb’s Booksmart software from their site. This application is fairly intuitive.

    Import the photos you’ve made so far for Assignment Five into the new project.
    Experiment with layout, text, titles and captions; when you’re satisfied with a draft, save it
    as a pdf. If you’re using Blurb the pdf will be watermarked with their logo but this doesn’t
    matter. If you’re keeping your learning log online, link this document into a blog post. If
    you’re keeping a hard copy log, print the pdf on regular printer paper.

    Make some brief notes about how you found working with the software and briefly evaluate
    your rough book design, describing any particular design choices and noting any influences
    in terms of other books that inspired you.

    If you’re thinking about producing a book for your self-directed project, you may want to
    email the pdf or send a link to it to your tutor for their comments.

  • On-line Exhibitions

    Task
    An online audio-visual piece doesn’t necessarily have to be the piece of art in itself, but may simply be part of the ‘presence’ of the work, put together to promote it, possibly to coincide with an exhibition or publication, or to help generate interest more speculatively. 

    A post by Sharon Boothroyd on WeAreOCA discusses a piece of work that is particularly relevant both to our discussions on contemporary landscape photography and the slideshow format. The sequence in question was designed to be the exhibition. Read the post and if you have any comments of your own, add them and include a link in your learning log.

    Looking at the Land: 21st Century American Views.

    This is a photo slideshow without sound curated for Flakphoto by Andy Adams. See discussion in Post by Sharon Boothroyd on WeAreOCA and student comments.

    This slideshow actually left me completely cold. Maybe I missed something here. I was unsure why any of these images had been chosen compared to the on-line collections of images of American photographers I looked at in Part 2 of this course: Landscape as a Journey, Nor could I understand why they were sequenced the way they were. The display as photos confirmed this sense.

    I found many other on-line slideshows that I consider more effective in their impact, see my post:

    Time-based audio-visual presentations

     

  • Denotation and connotation

    Denotation and connotation
    What level of denotation/connotation will your image have? You looked at this earlier in Part
    One in relation to Dorothea Lange’s image of the migrant mother.
    To give an example:
    • There are over 200 non-UK players in the Football League (negative – local players are
    being squeezed out).
    • There are 200 EU players in the Football League (neutral – bald fact).
    • There are only 200 EU players in the Football league. (positive – there could be many more).
    Project Altruism in practice

    The same information – 200 players – but a different inference depending on how you ‘spin’ it.
    And that’s just from the perspective of the football fan concerned for the future of the England
    team. Each of these statements would connote something quite different to a European player
    keen to play in the UK. And so it is with images. Small changes to an image can affect the
    meaning quite significantly and the same image will connote different things to viewers
    approaching it from a different cultural perspective.
    Skilled practitioners can bring a different sense to the images they offer, not by dramatic change
    but through viewpoint, composition and the content that they decide to deliver.
    Re-visit the case study on Lange’s Migrant Mother in your course reader and note the difference
    between it and other images from the shoot. Make notes on what each image denotes and what
    it connotes.

  • Documentary Integrity and Truth

    Being there

    How will you operate as a photographer?

    Will you ask permission or will you be a fly on the wall,
    a ghost who never affects the image? This is a major question relevant to your production ethics.
    If you tell people what you’re doing, then they’ll react differently to you; they may be guarded or
    wary of how you’ll portray them.

    Photographers who lived with the communities they were photographing:

    • Chris Killip with the sea coal gatherers in the North East
      of England
    • Martin Parr with the people of Hebden Bridge in Yorkshire.
    • Bruce Davidson has done a similar thing in New York.

    This is very different to the approach of Garry Winogrand or Cartier-Bresson, neither of whom interfered or announced their presence. Winogrand operated like a ghost but got quite close to the action to produce his wide-angle views, whereas Cartier-Bresson
    remained peripheral, on the edge, trying not to be important to the subject.

    Truth
    This is a big one for the social documentary practitioner. The image has to have integrity – it has to be honest and factual in order to validate it for the viewer as an accurate portrayal. This is arguably where the boundary lies between social documentary and photojournalism where the image has more of an editorial purpose. In photojournalism the choice of photographer and the style of image-making will always have to suit the editorial nature of the publication and this is perhaps a bridge too far for the documentary photographer. Most documentary photographers would have no objection to any magazine or media publishing their documentary images provided that they were published as the photographer intended the viewer to see them, not cropped or enhanced.

    Kendall Walton ‘Transparent Pictures’

    ‘Ambiguities and discontinuities’  Berger & Mohr 1995 p91.

    Bazin

    For the first time, between the originating object and its reproduction there intervenes only the instrumentality of a non-living agent. For the first time an image of the world is formed automatically, without the creative intervention of man…in spite of any objections our critical spirit may offer, we are forced to accept as real the existence of the object reproduced, actually, re-presented…’

    The Ontology of the Photographic Image 1945

    Sekula

    If we accept the fundamental premise that information is the outcome of a culturally determined relationship, then we can no longer ascribe an intrinsic or universal meaning to the photographic image.

    On the Invention of Photographic Meaning 1997 p454