Blueish tint in low saturation images converted to CMYK

classic Classic list List threaded Threaded
2 messages Options
Ari
Reply | Threaded
Open this post in threaded view
|

Blueish tint in low saturation images converted to CMYK

Ari
Hi, I post this here because I'm not sure if what I found is a bug or not.

This is with Digikam 0.9.0 final.

This is the scenario: I start with an sRGB JPEG image with very low saturation (looks nearly B&W). Open it in image editor, then save it as is as TIFF (8 bits, no compression).

Open the tiff in Krita or in Photoshop. Convert to CMYK. Voila, looks blueish.

Now: open the original JPEG directly with Krita (or photoshop). Save as tiff (RGB, 8 bits, no compression). Now reopen the tiff in Krita/PS and convert it to CMYK. Voila, looks nice, no blueish tint.


I run into this issue the hard way, after carefully preparing my images and then importing them to my Lab's  print order management application, that does some 'softproofing' that actually smells and behaves like CMYK conversion. All my carefully digikam-processed images were blueish!!

With Nikon D80-generated sRGB JPGs, Krita tiffs, Photoshop tiffs, look nice in this app. Digikam tiffs look blueish, totally different from what digikam shows. Maybe a color-profile-related problem?

My workaround is: generate the tiffs with Krita, then continue the workflow on digikam. Seems to work fine (will confirm when the prints are delivered...)

Anyone else ran into this?
Reply | Threaded
Open this post in threaded view
|

Re: Blueish tint in low saturation images converted to CMYK

Gilles Caulier-2
Ari,

Strange. Please, open a new file in B.K.O and post all picture file in this
file to perform advanced tests. Thanks in advance

Gilles

On Thursday 04 January 2007 07:13, Ari El wrote:

> Hi, I post this here because I'm not sure if what I found is a bug or not.
>
> This is with Digikam 0.9.0 final.
>
> This is the scenario: I start with an sRGB JPEG image with very low
> saturation (looks nearly B&W). Open it in image editor, then save it as is
> as TIFF (8 bits, no compression).
>
> Open the tiff in Krita or in Photoshop. Convert to CMYK. Voila, looks
> blueish.
>
> Now: open the original JPEG directly with Krita (or photoshop). Save as
> tiff (RGB, 8 bits, no compression). Now reopen the tiff in Krita/PS and
> convert it to CMYK. Voila, looks nice, no blueish tint.
>
>
> I run into this issue the hard way, after carefully preparing my images and
> then importing them to my Lab's  print order management application, that
> does some 'softproofing' that actually smells and behaves like CMYK
> conversion. All my carefully digikam-processed images were blueish!!
>
> With Nikon D80-generated sRGB JPGs, Krita tiffs, Photoshop tiffs, look nice
> in this app. Digikam tiffs look blueish, totally different from what
> digikam shows. Maybe a color-profile-related problem?
>
> My workaround is: generate the tiffs with Krita, then continue the workflow
> on digikam. Seems to work fine (will confirm when the prints are
> delivered...)
>
> Anyone else ran into this?
_______________________________________________
Digikam-users mailing list
[hidden email]
https://mail.kde.org/mailman/listinfo/digikam-users