[softwarelist] Re: CMYK problem

On Wednesday 08 July 2009 22:44:33 David Pilling wrote:
>  Is it possible to examine the PDFs to see what colour
> space they are?

To check the colour space of an image:-

First uncompress the PDF (on linux I use 'pdftk' to uncompress, but as you use 
acrobat software you probably already have the tools to do the decompression).

You can then examine the PDF using a text editor. (Note: the file may still 
contain binary data, between 'stream'/'endstream' pairs, but you can ignore 
this - it will be the individual pixel values of your bit-mapped image).

Locate an object with "/Type /XObject" and "/SubType /Image".

Within that object look for a tag "/ColorSpace" which is likely to have values 
of "/DeviceGray, /DeviceRGB, or /DeviceCMYK". 

You may find other tags for "/ColorSpace" elsewhere in the PDF (like the 
Resource Dictionary) but usually each embedded /XObject /Image specifies the 
colour space to use explicitly.

Cheers

Deri
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