Changing CMYK Colours

I have a requirement to make the same change over 2000+ gif images, at the moment all the images seem to be black to the eye, however on close inspection they are infact a Dark Grey.
The images are to be used with a system that automatically differentiates between black and white, the problem being that because they are dark grey and not infact TRUE BLACK (100% CMYK) the system makes these images ever so slightly transparent as it detects light in the 25% of the pixels in each image.
I am wondering if there is anyway of quickly or mass changing the CMYK of all images to 100% CMYK.
The problem being that the default "black" in illustrator is infact not 100% true black but dark grey and we do not have the illustrator files for the 2000+ images.
Obviously we can change them individually but at a substantial cost of extra staff hours.

>I am wondering if there is anyway of quickly or mass changing the CMYK of all images to 100% CMYK.
Not in a GIF, because GIFs are always RGB. Black in RGB is 0,0,0.

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Save as JPEG changes CMYK colour

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I have a solid colour in Photshop that I set CMYK values for (I work in CMYK image mode). When I save as JPEG, the resulting JPEG file changes one of the CMYK values by 1 percentage point. When I save as TIFF, it works fine (CMKY values match original photshop file). What is going on?
This is for CS4.
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I'm confused. If your goal is to print the image, why not open the jpeg in Photoshop, do a save as using the native .PSD Photoshop file format, and just continue to work and save in that file format? Going back to jpeg makes no sense.
In the first place, Jpeg does not support the CMYK color space, so every time you save it, it will save in the much smaller sRGB space. Also, between this and the fact that it compresses the image even at the highest settings, you are going to get changes in the image, including in the colors.
Just avoid all this and work in .PSD file format.
Another point: all of the photographers I know usually work in an RGB color space, Adobe rgb for example. As I understand it, CMYK is used in graphics and publication, often because you want to split the image into four channels to use in commercial four-color offset printing.
If you're going to be doing inkjet printing, or via a service, I'd suggest staying in an Rgb workspace--you can still decide to use the CMYK menu to select your colors.
Color management can be tricky, so I'd suggest you do a bit of research.

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Ok I have the the mixer channels editor open and I've changed CM and Y to be 0 0 0 0 and K (black) to 0 0 0 100
Not sure what has happened the black in the image now looks like a washed out grey, what should I have done.
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It sounds like it might be this: InDesignSecrets » Blog Archive » Eliminating YDB (Yucky Discolored Box) Syndrome

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Changing CMYK Colours

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