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Having read lots of posts it appears some RAW users do so primarily so that they can adjust WB later (yes, I know there are other advantages). Given that there is arguably a fair bit of extra work in a RAW workflow, wouldn't such users benefit from a basic firmware tweak that would allow for a jpeg to be recorded without any colour correction?
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Having looked at this issue quite a lot, it appears from experience that the WB changes are done *prior* to the Bayer interpolation and/or the JPEG compression. What the WB actually is, is a scaling of the 2x2 Bayer CFA array to normalise the sensors values prior to demosaiking.
Keeping the WB parameters and trying to apply it to JPEG should be possible, but I am sure that there will be some manner of colour abberations to sort out. Might be one to look at later.
White Balance so easy, even our 5 year old can do it.- Melissa Strickland
The way that the WB / CWB data is used in the D30/D60/10D/300D (guessing from intuition on the last one) is that the camera does AWB for *every* image, regardless of the WB setting.
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You know, I never really thought about it before, but I'm sure it would have come to me eventually (assuming I decided to think about it, that is [img]/ubbthreads/images/graemlins/grin.gif[/img]) since there really is no other way it can work for RAW and it makes since to use the same method for jpg.
It must store an AWB setting/value in every image file, jpg or RAW. It has to be stored in the jpg file so any file can be selected to be used for CWB, and it has to be stored in the RAW files otherwise there would be no way to select AWB 'post capture' if another WB mode had been selected when shot. It makes perfect sense. This is why taking AWB settings for each shot off of gray cards, or using a CWB setting of the gray card and using it for each shot, would yield the same results. This explains why the manual says you can have the WB set to any value when shooting a CWB shot.
Thanks Peter, this clears up a lot...
White Balance so easy, even our 5 year old can do it.- Melissa Strickland
I will be updating that information soon. I currently have a new multi-media-web-hosting project I want to get going, and one of its designed strengths, I hope, will be a level of sophistication for dealing with file metadata, including JPEGs and RAW files from various cameras. I hope. I am not holding my breath myself, but while I am between paying projects, it seems like a good idea.
Anyone with anything specific and technical to ask or contribute should consider joinging the mailing list on the page above.
White Balance so easy, even our 5 year old can do it.- Melissa Strickland
I'd like to add a couple of comments and questions on this.
I'm confused how you and the others are assumptions on how CWB works. My impression was that it basically creates a filter when you take the test shot. All that happens next, irregardless of the image, is this filter will be equally applied to each image.
All this filter does is take the compliment of the color it's trying to correct for and apply it to the test shot just enough to make the test card correct. This "setting" is then applied to each succesive image. Again, and hopefully, without any consideration for your mistakes.
As an aside, when PS CS first came out I found that its raw converter could not read manually set WB's (I do this often). Adobe confirmed this to be a "feature." Adobe also told me that they can't read canon's WB setting or don't want to take the time to make their converter work with every camera with raw capability (I got conflicting stories from the help line). Therefore, they do their own. Hence, why many people (eventually) found colors to be slightly different using adobe raw vs canon's converter.
Mike
White Balance so easy, even our 5 year old can do it.- Melissa Strickland
Linear Mode
