[softwarelist] Re: CMYK problem

On 09 Jul, Deri James <deri@xxxxxxxxxxxxxxxxxxxxxx> wrote:
> 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.

Thanks for this, its very useful.

My rejected PDFs originated with RGB sprites contained the tag:
[/Indexed /DeviceRGB 1 10 0 R]
Replacing the images with !Artworks-exported CMYK sprites resulted in PDFs
with the tag:
[/Indexed /DeviceCMYK 255 10 0 R]

which has to be a result!

-- 
William Lack
---------------------
william.lack@bt internet.com
County Series: http://home.clara.net/williamlack/index.htm
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