Re: On the use of wide-gamut RGB working spaces
Re: On the use of wide-gamut RGB working spaces
- Subject: Re: On the use of wide-gamut RGB working spaces
- From: Klaus Karcher <email@hidden>
- Date: Thu, 09 Oct 2008 13:30:27 +0200
Mike Strickler wrote:
2. Ultra-wide spaces are harder to do subtle edits in and should only
be used with 16-bit files.
Marco Ugolini wrote:
While I understand that caution in theory, in practice I have not suffered
ill effects from moves that appeared "excessive" following a small edit.
Again, as long as one works in 16 bits.
3. Use the smallest color space needed to encompass all the colors in
the original with a little room to spare--it makes editing easier.
Could you please provide a practical example that proves such an advantage?
I'm open to being persuaded by convincing evidence. Perhaps you are able to
spare an image or two that prove the point, if that is OK.
take an arbitrary skin tone in 16bit lab,
convert it once to sRGB and once to prophotoRGB
make an curve adjustment layer in both rgb images
command-click onto the color when the curve window is open to set a new
point.
Move the new point on the curve one step upwards by using the up-key on
the keyboard (this is the minimal change Photoshop's UI permits)
compare the results:
the change in the Prophoto image is much stronger than in the sRGB image
-- *too* strong in many cases. A workaround is to reduce the opacity of
the adjustment layer, but it's impractical.
Klaus Karcher
--
Klaus Karcher * Eichenallee 18
26203 Wardenburg * Germany
Tel. +49 441 8859770
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