Printing question ... sRGB ... Adobe RGB ... ProPhoto RGB

I usually do all editing in Photoshop and display images on web.
ACR is set to sRGB.

Was given a bunch of jpg's to edit and get ready for "Print".
I will print at home.


Should I change ACR to Adobe RGB or ProPhoto RGB ?

Should I also change 8 bits to 16 bits ?

Can the RGB modes be changed after editing ?

You want to work with RAW files in a 16-bit per color workspace, and then output to 8-bit JPGs for printing and web publishing. The JPGs should normally be in sRGB form, unless you specifically know the commercial photographic print maker you are using can [read aRGB without any conversion to sRGB before printing] or you have an aRGB capable home printer. Some printing services can accept TIFF 16-bit files.

If you already have sRGB* JPEG files then there is no point in making a conversion to a different colour space, since you will always have conversion losses, regardless of the direction of that conversion. ProPhotoRGB should only be used for 16 bit images, and I would be inclined to try to keep AdobeRGB images in a 16 bit space too.

I probably wouldn't up convert to 16 bit either, unless you had images with large areas of very fine gradients, to which you will have to apply a large tonal shift. In that instance the additional room that computing values at 16 bit will provide, may help to prevent posterization effects becoming visible.

*Your worse case situation will be that the JPEG files have no colour space information included, in which case I would treat them as if they were sRGB, or at least close enough to it to make no difference.

Alan

Wilt - Thank you.

Alan - Thank you.

I followed some of his threads on other sites and purchased his book. Long ago he said like others have pointed out to work in RGB or ProPhoto and then convert to sRGB unless you use a RGB capable lab. LR automatically opens RAW files in ProPhoto. I have ACR set to ProPhoto and DPP to RGB. I have been doing this for years.

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