convert -type Bilevel broken

[bill_h]

Hi all.

I was happily 'convert'ing on Ubuntu 10.04 using the built in version of ImageMagick, 6.5.7.8-1ubuntu1.1.

After I upgraded to Ubuntu 10.10 with ImageMagick 6.6.2.6-1ubuntu1.1 "convert -type Bilevel" started mangling my images. Essentially the image gets squished to the left, and a large black bar is on the right side of the image.

I thought this might just be an issue with Ubuntu but the same behavior occurs on Arch Linux with ImageMagick 6.6.4.10-1.

My usual invocation of the command is "convert -type Bilevel file.jpg file.png"

I did notice a difference in the 'identify' output for the old and new versions of ImageMagick.

Original image: SCAN0165.JPG JPEG 944x1616 944x1616+0+0 8-bit DirectClass 193KiB 0.000u 0:00.000
After convert on old/working ImageMagick: SCAN0165-1.png PNG 944x1616 944x1616+0+0 8-bit PseudoClass 256c 25.1KiB 0.040u 0
After convert on new/broken ImageMagick: SCAN0165.png PNG 944x1616 944x1616+0+0 8-bit DirectClass 32.6KiB 0.050u 0:00.050

Here is an example of working and broken output using the rose image on the ImageMagick convert "example usage" web page:

ImageMagick command: "convert -type Bilevel rose.jpg rose.png"

Original Image identify: rose.jpg JPEG 70x46 70x46+0+0 8-bit DirectClass 3.97KiB 0.000u 0:00.000
Orignal Image base64 encode:

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After convert on old/working ImageMagick: rose1.png PNG 70x46 70x46+0+0 8-bit PseudoClass 256c 641b 0.000u 0:00.000
rose1.png base64 encode:
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After converting on new/broken ImageMagick: rose.png PNG 70x46 70x46+0+0 8-bit DirectClass 852b 0.000u 0:00.000
rose.png base64 encode:
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Thanks!

[fmw42]

the following works fine for me under IM 6.6.7.4 Q16 Mac OSX tiger:

convert rose: rose.jpg
convert rose.jpg -type bilevel rose.png

The correct syntax in this case is to put the input image right after convert, though it usually does not matter. See

http://www.imagemagick.org/Usage/basics/#cmdline


By the way, the PNG format has been under development and improvements over some releases now and may have had some changes for the worse temporarily under certain releases. Review the changelog at http://www.imagemagick.org/script/changelog.php

[bill_h]

fmw42, you're right on the money. I downloaded/compiled 6.6.7-4. That version of convert works again.

[anthony]

Normally it does not matter. But in this case -type is a operator that could be used for input as well as output. And that can confuse IM in what you are meant for it to do.