My color space in photoshop is set at Prophoto RGB. When I convert an image from RAW using ACR and then save this image as a JPEG, the file size is usually 30-40% smaller with the same compression setting than if I convert from RAW in sRGB and save as a JPEG. If I understand correctly, color profiles are a key used to interpret color values of an image within a color space, why would it affect file size? And if prophoto RGB is consistently giving smaller files for the same compression setting, why isn't it the web standard instead of sRGB?
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