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I need to send a image as the title says. But the amount of RGB choices confuse me... There's sRGB built-in, sRGB, adobe RGB, apple RGB... I thought of choosing "Best RGB", is it okay...?

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Avoid Adobe RGB for anything other than storing your original. It has the largest gamut and is least "lossy" of the formats. –  Stan Aug 29 '13 at 0:12
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2 Answers 2

It depends on the destination of your image.

For web, sRGB is the standard. Unfortunately, not all browsers acknowledge your embedded profile so you have to destructively convert the colors.

For working with your photography, Adobe RGB will retain a much broader spectrum.

Here are a few questions on GD.SE that may help explain the profiles.

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sRGB is almost always the correct answer.

If you have not been specifically told by the printer you're sending the photo to, which profile to use, then use sRGB - as anything else is liable to generate incorrect results.

sRGB is the profile used by computer desktops, by the web, and by many print shops too (you may be surprised). A modified form of it is used by television and video. It's the default used by cameras, too. A few print shops may prefer Adobe RGB or even something else, but if they do, they'll make it abundantly clear. It also becomes difficult to preview and edit a file as soon as you use a colour profile other than sRGB.

sRGB is a relatively narrow-gamut colour space, meaning that highly saturated colours may be "clipped" or truncated, particularly when it comes to brilliant blue-green colours such as those found in peacock's tails, butterflies and iridescent objects. Thus there is a very high temptation to use a wider colour space such as Adobe RGB or something else. Unfortunately, correctly previewing and editing in such a colour space is made difficult by sRGB being the default colour space for computer desktops, monitors, televisions, the web, etc. Even if you do configure Photoshop properly to be able to view and edit a wide colour space such as Adobe RGB and you have calibrated your wide-gamut monitor accordingly, you will very often need to convert your image back to sRGB in order to export it for the web, for video, for a mobile device, or send it to a printer (unless the printer specifies otherwise).

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