Colour Profile Bug in CS4 32 bpc Mode?

This has been confirmed on both Mac and PC by different users
(this topic was confirmed on another list before posting here).
One may be working on an image that has a different colour profile
than set as default in colour settings. For example, colour settings
has Adobe RGB while the current document is in ProPhoto RGB. If the
ProPhoto RGB (16 bpc) file is taken to 32 bpc mode, the status message
reports that the file is in a modified linear space based on the input
profile. One may then perform USM, for example and then return to 16
bpc or 8 bpc mode.
Here is the bug: Once the ProPhoto RGB file is returned to 16 or 8
bpc, it now has the working RGB space tagged of Adobe RGB, rather than
the original ProPhoto RGB as input before 32 bpc conversion. This is
not just a tagging issue, the numbers have been converted to working
RGB rather than the input ICC that was tagged to the image prior to
entering 32 bpc mode.
ICC tagged image operations have been divorced from colour settings
since version 6, the document can reside in a space that is
independent of colour settings. I can't recall other operations that
change the files colour space and tag without user intention.
If using 32 bpc edits, to preserve the input space, one either has to
change their colour settings to match the document or convert the
document to working RGB.
So why this reversion to working RGB and not the document RGB - bug or
design feature/limitation? Did CS3 work this way, is it only my
version of CS4?
I have searched the help notes, this forum and other Adobe support docs,
however I could not find this issue documented.
Sincerely,
Stephen Marsh

Can anyone post a supporting argument for the current behaviour (design or bug). While in 32 bpc Photoshop "knows" what the original profile is (it is listed as being in a linear state), while on default conversion to lower bit depth the data is converted to working RGB, rather than the document RGB prior to conversion (if different to working RGB). Am I missing something - is this a good thing, should this be behaviour be changed?
OK, topic drift it is!
Buko/progress, it is not so much bit depth in this case, it is gamma encoding - or lack thereof. 32 bpc mode processes in linear gamma, which can have an effect on some operations for certain receptive image content (tonal moves, USM, interpolation etc).
As one example, some links to linear resampling can be found in the comments at this blog:
http://forensicphotoshop.blogspot.com/2008/11/resize-smaller-part-2.html
I prefer the 32 bpc route to linear processing rather than the alternative, which is 16 bpc and a hacked custom RGB profile set to gamma 1.0.
I don't like linear USM for output sharpening (nasty dark halo artifacts). However, for subtle capture/acquisition sharpening linear USM may be preferred for certain images. I generally sharpen with blend if sliders limiting the intensity of the light halo, which comes close to one aspect of linear sharpening (light halo reduction). This can also be achieved by blending the USM in two separate layers, set to darken and lighten blending with reduced opacity.
While on USM and gamma, there are some L* based RGB working spaces such as L*RGB or the new ECI RGB which behave the same way as Lab mode Lightness channel sharpening (when set to Luminosity blend). As the response of the Lightness channel is different to linear gamma and standard gamma encoded spaces, for some image content one may be preferred over the other as the processing space.
I would still like to explore the original topic/post before submitting a bug report. How do you think things should work?
Regards,
Stephen Marsh

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http://www.adobe.com/support/contact/cs3clean.html
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There needs to be an option in either the Keynote preferences or export options to save exported images without colour profiles.
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I've been exporting keynote slides as png's to use in video presentations. The problem is that the png's are saved with colour profiles, which means if I export the images from diferent macs, or even the same mac but with a different monitor attached (therefore a diferent monitor colour profile active), the images have very noticeable colour variations.
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This time, Windows Photo Gallery preview is showing the (unedited, straight out of camera) photo as it should be... Photoshop opens it too contrasty.
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I appreciate any help.

eartho - All my images are already converted to the sRGB colourspace by default, as far as I can tell. My images out of camera, the ones I have edited and saved as jpg - I even checked some old images. Through Mode/Convert to Profile, they're all already set to sRGB.
emil emil - Thank you. I will do that in the morning - right now my head hurts and I need my bed.

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Joy

well ive used both of the newest versions of vmware fusion and parallels and let me tell you, in my personal opinion i prefer parallels.
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My Mac mini (late 2012) seems to switch colour profiles.

Dear community,
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Sorry, problem solved. Dell monitor "smart video enhance" feature meets own stupidity.
Maybe a mod could delete this discussion.

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