[reconvert ICC]

37 minutes ago, MEB said:

 

Hi Zahra1281,

No, the ColorMatch RGB is a slightly wider color space than sRGB but it doesn't cover/overlap all the sRGB space. Some ColorMatch RGB colours can't be accurately represented by the sRGB colour space (and vice versa) so there will be some loss here when you do this conversion.

 

Converting directly from sRGB to ProPhoto RGB is a better option because it covers almost all the sRGB/ColorMatch RGB gamut/colours and so any loss is kept to a minimum.

thanks a lot for the explanation...

[reconvert ICC]

23 hours ago, MEB said:

Hi Zahra1281,

Welcome to Affinity Forums

If you assign a profile to a document, you are simply tagging the document with a new profile - there's no change to the raw colour values/data data but the appearance/colours of the image may change considerably to reflect the new profile.

 

If you convert a profile to another, the raw colour values of the image will be modified in an effort to keep its visual appearance intact so in this case you have not only changed the associated profile but also the raw colour values/data of the image. This is a destructive process and should only be used for certain purposes for example when preparing a document for a specific output.

Hi,

 

thank you very much for the explanation, I think I understand (theoretically) but, unfortunately, I have a practical problem with which I still do not know the advice.

 

I have a bitmap webdesign, whitch I am creating for a very long time and during the creation I converted file to ColorMatch RGB and later to ProPhoto RGB and I do not know if the input data is invalidated for example by converting to ColorMatch RGB.

 

I did something similar like in this video:

Likewise, I have a file with a lot of pictures (mostly .jpg exports of previous works from Photoshop in sRGB) for the web and with this file, unfortunately, I did something similar.

 

So I would like to ask if I can. When I create a document, for example, with a sRGB profile, convert it to ColorMatch RGB and then to ProPhoto RGB, is the same result as if I convert the original sRGB prfofile directly to ProPhoto RGB?

[reconvert ICC]

45 minutes ago, owenr said:

No, profile conversion changes a document/image's data in an attempt to preserve the visual appearance.

Simply assigning a new profile will not change the data, but the appearance may be dramatically changed.

 

 

So the function "convert ICC profile" de facto converts working space (colour space)?

[reconvert ICC]

3 hours ago, toltec said:

 

Hi Zahra1281

 

You seem to be getting ICC profiles and colour spaces mixed up. You can't convert files to different ICC profiles. You can apply different ICC profiles, which is not the same thing. You can convert the files working space (or colour space).

 

A typical colour space is Adobe RGB, sRGB or ProPhoto RGB. Whichever one the file is in, affects the actual colour information in the image. This information is device independent.

 

ICC profiles change how that information is displayed, or printed on a particular device. They do not change the information in the image. Basically they "tweak" the image slightly to make up for inconsistencies between devices.

 

As for converting colour spaces, if you look in Preferences, there is an option to "Convert opened files to working space". That will change the image as you load it. i.e. from ProPhoto to sRGB

 

At least, that's the theory as I understand it.

If I understand correctlythe, function "convert ICC profile" only change the original ICC profile in document?
So, when I change it I change only the visual scene of the document but do not change the data?
Theoretically I can convert ICC profiles many times and my .jpg stay be same like in the begining (in one Affinity Photo file)?

(I apologize for weaknesses in English)

[reconvert ICC]

Hi,

 

I would have a question about converting the ICC profiles. If I have .jpg and I paste it into the Affinity Photo file and converting it to different ICC profiles several times, is there any "damage"?

 

For example, when I have a 100 .jpg pictures in one Affinity Photo file with sRGB, I convert file to ColorMatch and then to ProPhoto. Is the same result as converting the original sRGB directly to ProPhoto?

 

 

Thank you very much for all the answers...