Re: convert CMYK image to SRGB

On Thu, Aug 6, 2015 at 9:52 AM, Bob Friesenhahn <
[email protected]> wrote:

>
> I did not see your message until today.
>
>
No problem ;)


> The image_ycck.jpeg file has no attached ICM profile but test-YCCK.jpg
> does.  Also, image_ycck.jpeg has a black channel, but it is all zeros
> whereas test-YCCK.jpg has useful data in its black channel.  The
> image_ycck.jpeg file requires that you first supply a ICM profile for the
> current colorspace and then supply the ICM profile for the target
> colorspace so ProfileImage() needs to be invoked twice whereas it only
> needs to be invoked once for test-YCCK.jpg.
>
>
Ah, I think that's where I was going wrong, I was only trying to get this
to work with a single invocation of ProfileImage. This completely clears
things up.


For one reason or another, colorspace transformations use the 'Transform'
> logging classification so use
>
>   export MAGICK_DEBUG=Transform
>

Thanks!

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