How do you prevent PDF presets to alter the quality of the image
Experimenting different PDF presets, I noticed with grayscale images in Photoshop, save to PDF using different presets, change image quality, more precisely the contrast.
So, it seems that saving an image in the 'bad' PDF preset could undo a lot of pre-press work. Is there a better way/format?
To get an idea of brute: there is a decrease of 8.7% in the percentage of black between 10% and 50% of the values (the beach) on a corner of the stage between the original in Photoshop and PDF high quality, who showed the same values, and PDF/X-1, which has compressed the range of 4 (about a decline of 8.7%) percentage points.
A visual assessment and idiosyncratic, four versions of the same image (Photoshop in grayscale, High Qualtiy PDF, PDF/X-1a and PDF/X-3), which included a step wedge and the color ramp, would rank the fidelity to the best original, high quality, at worst, PDF/X-1a.
The same image to grayscale in Photoshop CS6 was distilled (file > print > Adobe PDF) to PDF using without changing settings predefined PDF in distiller Acrobat XI.
The screenshot next composit (all four images images on the screen copy screen, rearrange them, and then reduce the image to a 120 dpi to 4.2 "wide (including the text) gives an idea of the differences, but much was lost, it's here.)
Walton
I can't pretend that it's simple. There was a lot of choices to accommodate the many different requirements of professional pre-press. Same people experienced can fight to get the color corresponding to the work because they know that it should.
The key thing to remember is that in the color management, it is never a profile in question. There are always two (or four, or six...). One, the source profile, described the colors in your document. The other, the destination profile, describes a device. This device could be the screen that you discover on the printer you are printing on, or a device that is simulated.
So, by looking at three PDF files on-screen.
'High quality '. Source: mast 20%. Target: your screen. It's probably closer to the color displayed by Photoshop, which will do something similar.
PDF / X 3. Source: mast 20%. Target: output mode, coated FOGRA27. Then you must convert more using two profiles to see on the screen.
PDF/X-1 a. DeviceGray (no marking). This (by the rules of PDF / X, but not PDF in general) is the gray channel of the output mode, coated FOGRA27. So no converson up here, but it will be converted using two profiles to see on the screen.
Why FOGRA27? Because you him to choose, or in default, in your settings to distill. This is not a good idea, unless you know that it is the correct output for your printing needs device. This information must come from your printer, and you can't do really good PDF / X files without it. If you choose at random, you can expect more and unpredictable color changes.
Tags: Acrobat
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