Color changing under graphic inclusion with graphicx

[Herbert Voss]

Am 09.01.21 um 22:53 schrieb Paulo Ney de Souza:
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>
> On Sat, Jan 9, 2021, 1:27 PM Herbert Voss <Herbert.Voss at fu-berlin.de 
> <mailto:Herbert.Voss at fu-berlin.de>> wrote:
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>
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>     No, it means that _all_ used colors on LaTeX level will be
>     converted into
>     the RGB model. By default xcolor uses rgb (0..1).
>     This is only a problem when using an image as background. The
>     colormodell on LaTeX level must be the same as the color model
>     of your image. Otherwise blue (cmyk) is not blue (rgb) ...
>
>
>
> Well, but in my case the background is in RGB. The images are in RGB, 
> and color is the same in all 4 of them. Two show the difference 
> against the background and two do not. What is the difference between 
> the first two images and the last two images?


I am a bit puzzled, because I cannot reproduce the problem ...
will have a look later today

Herbert



>
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>     no, there are a lot of possible color models and all must be converted
>     into one which are valid for the PDF.
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> Isn't PDF the format that allows many color models on the same page?
>
> How would anyone produce a graphics in RGB and another in Lab in the 
> same page with that restriction?
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>     >
>     > 3- What does the second row of mages have that the first do not???
>     >
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>     I do not understand this question. I used only your four images.
>
>     Herbert
>
>
> I attached 4 files and they have the same background color and two of 
> them show the problem and two not. What is different on the graphics 
> to display that behaviour?
>
> Paulo Ney