Uhm... I think I know where the problem ... the color profiles, because when I open the file "pack1.jpg" in photoshop it shows me a message like that has no color profile associated with the image.
When I save that file with the AdobeRGB profile, the color returns to normal!
I have a problem with the function-composite, need to generate a composite of several images for printing, but the final composition loses quality in color (something like the saturation of images that make up the composition ...