Subject | Re: Any Minolta/Sony users using UFRaw and GIMP? |
From | Alan Browne |
Date | 04/20/2014 15:55 (04/20/2014 09:55) |
Message-ID | <bZ6dnaL6W4tbTM7OnZ2dnUVZ_qydnZ2d@giganews.com> |
Client | |
Newsgroups | rec.photo.digital |
Follows | Eric Stevens |
Followups | Eric Stevens (8h & 50m) |
Eric StevensI have no definite answer - but consider that the way the information is stored in memory to work in Lab and RGB may be different and therefore require a conversion. If I load a really large raw (which then is shown to be 16 bit RGB) and then change it to Lab, there is "flash of change" in the image on the screen - as if it has been redrawn on the screen following a conversion.
They are quite definite in stating that the Adobe CMS uses Lab space for colour. https://dl.dropboxusercontent.com/u/31088803/CMM.jpg is the diagram included with that section of the text.
I don't know but I suspect that the various modes made available by Adobe to the user only affect the various controls, filters, tools etc made available to the user. In the end they all work on the profile connection space.
If my understanding is correct then it doesn't matter what mode you choose to work in: your image comes in and is converted to Lab. When the image goes out it has to be converted to RGB, CMYK or what ever it is you want. Your choice of mode only affects the various tools etc with which you manipulate the data in the CMM. If that is the case the idea is incorrect that working in Lab mode requires twice as many conversions as working in other colour modes.