Another RAW conversion issue

[OldTimey]

Hello,

I shoot with a Canon Digital Rebel, and convert CRW files to 16-bit tiffs using Canon EOS Viewer Utility. However, i have noticed that when converting and saving a crw to a tiff, EVU dramatically alters the image. If i compare the preview of the CRW and the then the saved TIFF side by side, i notice that the the TIFF's colors are always a bit more saturated. When using sRGB profile, the histogram gets dramatically altered as well. I have found that when shooting in and using the Adobe RGB profile, when i convert to a tiff (with no software image adjustment) the histogram is not altered (or not by much) but the color saturation problem is still there.

This is the original previewed crw file. ARGB color profile, no image adjustment.

[OldTimey]

This is the crw converted to tiff. notice the color differences. no adjustments made in EVU. Whats going on?

[Hellashot]

With what color profile are you saving your TIFFs? Sounds like you might be taking images in sRGB but saving them in Argb which changes the color space. If you shoot in Argb and save in Argb you will not notice color change. Also that conversion program isn't the greatest, I found Photoshot Elements 3 a lot easier to use when converting RAW. It won't blank the screen when you apply corrections to an image like the File Utility does. That makes it hard to tell how the image changed.

[PacAce]

With what color profile are you saving your TIFFs? Sounds like you might be taking images in sRGB but saving them in Argb which changes the color space. If you shoot in Argb and save in Argb you will not notice color change. Also that conversion program isn't the greatest, I found Photoshot Elements 3 a lot easier to use when converting RAW. It won't blank the screen when you apply corrections to an image like the File Utility does. That makes it hard to tell how the image changed.
Care to elaborate on this a little bit more. I use EVU all the time and I've experienced this "blanking of the screen" you are talking about. And FYI, File (Viewer) Utility is a different program from the EOS (VIewer) Utility.

[PacAce]

Hello,

I shoot with a Canon Digital Rebel, and convert CRW files to 16-bit tiffs using Canon EOS Viewer Utility. However, i have noticed that when converting and saving a crw to a tiff, EVU dramatically alters the image. If i compare the preview of the CRW and the then the saved TIFF side by side, i notice that the the TIFF's colors are always a bit more saturated. When using sRGB profile, the histogram gets dramatically altered as well. I have found that when shooting in and using the Adobe RGB profile, when i convert to a tiff (with no software image adjustment) the histogram is not altered (or not by much) but the color saturation problem is still there.

This is the original previewed crw file. ARGB color profile, no image adjustment.
Let's start by ruling out the most obvious causes first. Have you calibrated and profiled your monitor already?
How do the pictures look when you bring them into Photoshop (or whatever color managed photo editing you're using). Mac or PC?

[OldTimey]

Thanks alot folks.

all pictures were shot in RAW, using Manual mode on the digital rebel, with Adobe RGB selected in the parameters sub menu. When converting from RAW to TIFF, none of the parameters are modified.
I am viewing pictures on an electron 19 blue IV monitor, that ive only been able to calibrate by eye, using apple's colorsynch utility. (im using mac os 10.3.8) I use photoshop 7, since i heard that PSCS is a bit slower than 7 on older macs. (Running PS7 on an 867Mhz g4 powerbook) Because of this, i cant view crw files in photoshop. Upon viewing the 16-bit converted tiff in PS7, and being sure to assign the tiff Adobe RGB color profile, i noticed that the color shift disappeared, however they still dont match perfectly as far as contrast or brightness goes. Below i attached a comparison jpeg: from left right: The crw file as previewed in EVU, the converted tiff in PS7, and the converted tiff as previewed in EVU.

[PacAce]

Thanks alot folks.

all pictures were shot in RAW, using Manual mode on the digital rebel, with Adobe RGB selected in the parameters sub menu. When converting from RAW to TIFF, none of the parameters are modified.
I am viewing pictures on an electron 19 blue IV monitor, that ive only been able to calibrate by eye, using apple's colorsynch utility. (im using mac os 10.3.8) I use photoshop 7, since i heard that PSCS is a bit slower than 7 on older macs. (Running PS7 on an 867Mhz g4 powerbook) Because of this, i cant view crw files in photoshop. Upon viewing the 16-bit converted tiff in PS7, and being sure to assign the tiff Adobe RGB color profile, i noticed that the color shift disappeared, however they still dont match perfectly as far as contrast or brightness goes. Below i attached a comparison jpeg: from left right: The crw file as previewed in EVU, the converted tiff in PS7, and the converted tiff as previewed in EVU.
This is what has me confused. You say you assign Adobe RGB to the TIFF file? How, exactly, are you doing this? If you converted the RAW file using EVU, EVU should have embedded the Adobe RGB profile into the file so that when you open it in PS 7, it will know that the image is in Adobe RGB.

What is your working color space in PS 7? My guess is that it's not Adobe RGB, otherwise, your TIFF should have just opened up without prompting you for the profile type.

[OldTimey]

You can assign a file a color profile by clicking image->mode-.assign color profile. I am definitely using Adobe RGB as my working space. Im beginning to think its just a discrepency in the EVU previews and displays files.

thanks for you help.

[PacAce]

You can assign a file a color profile by clicking image->mode-.assign color profile. I am definitely using Adobe RGB as my working space. Im beginning to think its just a discrepency in the EVU previews and displays files.

thanks for you help.
Why are you assigning an Adobe RGB color profile to an image that's already in the color space? It really shouldn't make any difference since the image was already in Adobe RGB color space but I'm just curious why you did that?

BTW, when the Assign Profile panel comes up, which of the following choices did you select?

1) "Don't Color Manage This Document"
2) "Working RGB: Adobe RGB"
3) "Profile: sRGB IEC61966-2.1"

[OldTimey]

You are right, i dont need to assign it a color space, it should already be in ARGB. I just did it too make sure that it was in the correct space.