mRAW, purple shadows, why ??

When bought my 60D I have notice that when I use fill light (under camera raw) was getting a bit of purple on the shadows, then using photomatix with 1 single raw some pics had a lot of purple on the shadows. So i thought it was a defect of the canon raws (I must confess I was thinking on switching to a d7000 )

After a lot of search I found this blog http://dougplummer.blo​gs.com …ller-raw-file-option.html

So I make a quick test:

Here is the Full Raw (camera raw defaults)

Not used Photomatix but I suspect it was not designed to process mRAW files. I know DxO can't deal with mRAW.

The problem is also on Camera Raw / Lightroom when used fill light, was getting a bit of purple on the shadows.

I think the problem is because mRaw is not the native resolution of the sensor. But what is doing the camera to make the mRaw ? the million dollar question hahah, some space of the sensor is turned off? the firmware rescale the image? or what lol

Understanding the bayer filter, could this be, because the algorithm used is not taking in account the green channel at 100% to make the mRaw ? Because if we mix the color red-blue we will get purple..

Hmmm.... strange. I don't get any purple shadows using sRAW on my 1Ds3. But then again, I never really looked closely. Now I'm curious.

Looks like photomatix isn't designed to handle the mRAW format correctly. There are several programs that won't use it. You could try loading the mRAW into DPP or some other compatible app and then saving it out as a DNG and seeing if photomatix likes that more.

I use mRAW sometimes with my 60D at high ISOs like 6400. Photoshop CS5 processes them just fine, and there is no problem with purple that I can see. Incidentally, mRAW on the 60D represents a 25% reduction in the number of pixels in each dimension (0.75x0.75x18Mp = 10Mp), so the Canon software is doing a downsizing operation like bicubic interpolation for the downsizing, just as CS5 would. Simply eliminating every fourth pixel in each dimension would produce horrible color artifacts without interpolation.

Could be that photomatix is not designed to load the mRaw, but i have seen the problem when Fill light is added, for example like in the blog I mention in my first post. Today I will do some more test but using the fill light, I have found that when the latitude is a bit big (exposing for highlights) and the fill light is needed, then there is the "violeta/magenta/purpl​e" cast.

On this pic is the first I notice when i just bought the 60D, was testing an M42 lens

I'd say that you should install the Canon Raw software Digital Photo Professional and use it at least as a reference for these files. The problem my be as simple as the fact that your software does not know how to process the 60D files properly.

Tony, I use Photoshop CS5, I see DPP very limited, I give it a try also, but just doesn't WoW me. But what is weird, this only happen with mRaw's and not all of them.

Please don't misunderstand me, i'm not talking bad about Canon, this "problem" lead me to know how the mRaw is created, and that could explain why... could be something technical about the Bayer filter, that is known to have Red/Blue/Green/Green. Because if we mix the color red and blue you will get the color purple.

I'm just curious than something else.

Well, your results from Photoshop Camera Raw are pretty dramatically different from your Photomatix results, so the question is are you seeing something actually in the mRaw or is it just a variation in how software is interpreting the Raw data? I was suggesting DPP because it will give you another "look" in how software is taking different approaches to the data.