SOLVED! Possible Bug? when using Identify -format and the compression attribute?

[JoshuaInDC]

Hi Everyone,

I can't figure out why Imagemagick is giving two different outputs for the same file. See my commands and outputs, and tell me if I have missed something, or if there is a bug.

identify -format %p-%C\n CompressionError.tif
and
identify -format %p-%[compression]\n CompressionError.tif

I thought that I would receive the same output from both commands, but I don't. Are these two parameters different? Does one apply to the input file, and another to the output file? I don't notice any differentiation on the manual website. Any suggestions?

See the batch output below, and note that I am using the old way of calling identify.

C:\Temp\Compression Improvement Test>identify -format %p-%C\n CompressionError.tif
identify: Incompatible type for "RichTIFFIPTC"; tag ignored. `TIFFFetchNormalTag' @ warning/tiff.c/TIFFWarnings/1037.
0-LZW
1-LZW
2-LZW
3-LZW
4-LZW

C:\Temp\Compression Improvement Test>identify -format %p-%[compression]\n CompressionError.tif
identify: Incompatible type for "RichTIFFIPTC"; tag ignored. `TIFFFetchNormalTag' @ warning/tiff.c/TIFFWarnings/1037.
0-LZW
1-None
2-None
3-None
4-None

Thanks!

[dlemstra]

Could you also share your CompressionError.tif file?

[JoshuaInDC]

Here is the link. This was a file that was processed and cleaned up in Photoshop I believe.
https://1drv.ms/u/s!Ak3IHZNUKeG2id8gcmT32x_2XVxczg?e=GZCWwt

[urban-warrior]

By default, image identification is light weight and fast. It only guarantees accurate results for a limited number of image attributes such as width, height, scene, and format. See https://imagemagick.org/script/identify.php. To retrieve accurate image properties, add +ping to your command-line. Its a slower process, but guarantees accurate results:

$ identify +ping -format "%p-%[compression]\n" CompressionError.tif 
identify: Incompatible type for "RichTIFFIPTC"; tag ignored. `TIFFFetchNormalTag' @ warning/tiff.c/TIFFWarnings/1037.
0-LZW
1-None
2-None
3-None
4-None

$ identify +ping -format "%p-%C\n" CompressionError.tif
identify: Incompatible type for "RichTIFFIPTC"; tag ignored. `TIFFFetchNormalTag' @ warning/tiff.c/TIFFWarnings/1037.
0-LZW
1-None
2-None
3-None
4-None

[JoshuaInDC]

+PING is the solution!
Thanks for that!
Learn more here by searching +ping.
and also
Learn about +ping