Hu... But if you integrate a profil... and this one corrects the image colors and works ONLY with mac... you have color shift on the others screen. Without profil, no problem there => when you make jpeg of your webdesign layout (for example), it's in srgb by default. I think i express myself very badly. USUALLY, when i make a webdesign layout... when i import photos or element IN photoshop, i don't integrate profils (without color managment option) but when i export, it's always srgb (by default on my computer). LIKE this i have no color shifts. When i did let profile when i imported the elements, after the export i had color shifts! EDIT: nope, i verified, i don't integrate profil when i export... If i do, i have color shift... EDIT 02: so finally I made research about this and D Fosse is right: keeping profile is important. In the case of a website layout => the easiest way = convert all import to your workspace color. And export in srgb + profile in it.
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