Hello, When I generate print-ready pdf files in InDesign, and then look at the pdf using Adobe Reader, the dark regions of the photographs come out completely black. I have opened the pdf in Adobe Reader, then saved a screen dump, and then opened the latter in Gimp, in order to check the exact RGB values in the dark region. Everywhere in the dark region, the colors are like #000001 or #010002 or similar. When doing the same with a screen dump of InDesign, I find values like #251B11. As a result, in InDesign I still see lots of details in the dark regions, but in the pdf, I don't. In the picture as shown on screen in Adobe Reader, the information about the nuances and shades seems irretrievably lost. Using ImageMagick's "identify" command, the source image is reported as JPEG 3881x2912 3881x2912+0+0 8-bit sRGB 1.09648MiB 0.047u 0:00.038 which specifies the original color space, sRGB. Using "PDF Shaper" to extract the image from the pdf file, the resulting image identifies as: JPEG 2044x1534 2044x1534+0+0 8-bit CMYK 704048B 0.000u 0:00.001 which specifies some CMYK color space. Clearly, when displaying the page on a screen, Adobe Reader must convert the CMYK back to some RGB color space. In the resulting round trip conversion, almost all information is lost from the dark region. I cannot tell to what extent the information is lost in the first or second conversion. What can I do? Should I better have InDesign work entirely in the sRGB color space? Is this possible? If so, it would be left to the printer's software to do the required conversions to whatever color spaces his machinery does work in. Is there any point in having Indesign convert the pictures to CMYK? Thanks
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