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Wrong EXIF values for CRW files
Posted: Tue Dec 26, 2006 11:47 am
by Mike2005
The Shutter Speed and Exposure Time values seem to be miscalculated for (Canon) camera raw files in XnView beta 6.
Examples:
Example 1, converted by Photoshop (Exposure Time = 1/200)
and the
original CRW file (Exposure Time in XnView = 1/189).
Example 2, converted by Photoshop (Exposure Time = 1/60)
and the
original CRW file (Exposure Time in XnView = 1/70).
V1.90 B6
Re: B6: Wrong EXIF values for CRW files
Posted: Sat Jan 06, 2007 3:04 pm
by xnview
Mike2005 wrote:The Shutter Speed and Exposure Time values seem to be miscalculated for (Canon) camera raw files in XnView beta 6.
Examples:
Example 1, converted by Photoshop (Exposure Time = 1/200)
and the
original CRW file (Exposure Time in XnView = 1/189).
Example 2, converted by Photoshop (Exposure Time = 1/60)
and the
original CRW file (Exposure Time in XnView = 1/70).
The files are no more here
Re: B6: Wrong EXIF values for CRW files
Posted: Sat Jan 06, 2007 9:50 pm
by Mike2005
xnview wrote:
The files are no more here
I uploaded the files to another provider and changed the links in the original post. So it should work again...
Bang !
Posted: Sat Jan 06, 2007 11:58 pm
by Clo
Hello !
• I got your file
Example 1, and XnView 1.90 ß-6 crashes immediately when attempting to read it…
KR
Claude
Clo
Re: B6: Wrong EXIF values for CRW files
Posted: Mon Jan 08, 2007 2:14 pm
by xnview
Mike2005 wrote:xnview wrote:
The files are no more here
I uploaded the files to another provider and changed the links in the original post. So it should work again...
Ok, i've checked with ExifTools, and have the same result. So don't know how photoshop find these values...
Re: B6: Wrong EXIF values for CRW files
Posted: Mon Jan 08, 2007 10:58 pm
by Mike2005
Strange....
PS has its quirks, but I think, here it is right.
The thumbnail files (.THM) have the same values as the PS conversions. But when I did the conversion, the CRW file was not in the same directory as the THM, so PS couldn't base its conversion upon the THM data.
You'll get also the same values when converting with Canon's EOS Viewer Utility.
I first thought that these progs use the EXIF information in the embedded JPEG file but it seems that the latter doesn't contain EXIF data.
If you look at the output of ExifTool, there's a tag "
Target Exposure Time" which has (almost) the same value as the "Exposure Time" tag in the PS conversions. You can see the gap between "Target Exposure Time" and "Exposure Time" also in
this sample output of ExifTool, I found on the net. So the solution maybe is to use the "Target Exposure Time" tag instead of "Exposure Time". If you based the CIFF decoding upon Phil Harvey's work, it's perhaps a bug in his code?
