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Descubra todo lo que Scribd tiene para ofrecer, incluyendo libros y audiolibros de importantes editoriales. Make Your Own Transfer Function.
What you see is not always what you get. The analytical evaluation method presented in this paper is based on manual methods described in that book. A basic understanding of the photographic process, including sensitometry and densitometry, and the use of Microsoft Excel, is assumed. This paper and the accompanying spreadsheet is provided as is, and the user agrees to accept all consequences that may result from their application, without holding the author responsible or liable in any way, shape or form.
The purpose of a transfer function is to bring the subjective tone-reproduction cycle full circle, and closely match the fi- nal print to the on-screen image. To do so, a transfer function must correct for the differences between the actual and the desired process characteristics. In order to design a transfer function, these differences must be clearly understood. Desired process characteristics are typically expressed through a personal rendering intent, which gives us de- sired print reflection density for every on-screen value.
Our spreadsheet provides several tabs with different rendering intents for glossy, pearl or matte papers and personal pref- erences in shadow contrast. The target densities for each rendering intent are shown in cells C With the help of a step tablet, we are able to determine the actual process characteristics, regardless if an analog or digital process was chosen.
Comparing actual and desired process characteris- tics will allow us to design the necessary transfer function. A well-designed step tablet simplifies the development of a transfer function.
The self-made example in fig. It is available from my website or can be constructed easily with any suit- able drawing software.
Open the step tablet in your photo editing software, and run it through your process, whatever that may be, to bring it to paper.
For example, if your process includes a digital inkjet negative, send the file to your printer with your typi- cal settings and produce such a negative. Then, make a test. ISBN It is available from my website or can be constructed easily with any suitable drawing software. The software will calculate the output densities in cells E and plot the transfer function. Tone it, if that is part of your standard process, and wait until the print has fully dried.
Open the spreadsheet and select the tab with the appro-. Measure the actual output densities. From now on, this transfer function is applied to every digital image after final image manipulation, and just prior to committing it to the chosen process and the print media this transfer function was made for. This ensures that the final print will always be a close match to the on-screen image as seen on your monitor, even if process and paper changes, because all transfer functions designed this way are based on the selected rendering intent.
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Goldstein, E B - Sensacion Y Percepcion Upem
Embed Size px x x x x In the 's, it looked as though radio, by acquiring sight through the development of television, would soon be a closed chapter of the past, just as the pictures of the silent flm had been expected to lose much of their visual symbolism when the actors became able to communicate by speech. Indeed, my attempts to praise the virtues of radio and flm may have come from a conservative disposition to guard the accomplishments of vanishing arts. However, the following decades showed that sound without image and image without sound satisfed such basic human needs that they would not simply be displaced when television and the talking flm endowed popular spectacles, with a more complete sensory presence. Speech and music have a completeness of their own, and so do moving images. Therefore, in one form or another, they have been allowed to continue to act as pure sounds through the ages. And the direct expression of visual images has continued to provide the motion picture with its most powerful efects, all the talking notwithstanding.
Arnheim Rudolf- Arte y percepción visual
Arnheim Rudolf Arte y Percepcion Visual