Google| Subject | Re: Is RGB to Lab lossy? - was(Re: Lenses and sharpening) |
| From | nospam |
| Date | 2014-10-07 23:26 (2014-10-07 17:26) |
| Message-ID | <071020141726286486%nospam@nospam.invalid> |
| Client | |
| Newsgroups | rec.photo.digital |
| Follows | Eric Stevens |
In article <csk43a5ksgmeitftukl861detb599ksemg@4ax.com>, Eric Stevens <eric.stevens@sum.co.nz>wrote:
the point is that a lab conversion is completely *unnecessary*.Eric StevensEric Stevensnospam
There is nothing you do in image processing which is not lossless.
straw man.
Not at all. If you are going to criticise conversions to Lab on the graonds that they incur losses, then you have to acknowledge that there are other things you can do in Photoshop which are equally lossy.
the other things are not.
not always.Eric StevensFor some reason the conversion of RGB -->Lab has been particularly singled out for criticism in this respect.nospam
it's a bad workflow because what can be done with an rgb->lab-rgb conversion can be done *without* the conversion and with better results.
'Bad' is a value judgement.
Why should your value judgement be taken any more seriously than anyone elses?because it's based on facts.
if you can do x with a lossy step or a lossless step, the lossy step will always be worse than the lossless step. very simple.
2014-09-13-
