magick.exe 7.0.9 -monochrome does not work

[cwong]

Platform: Windows 10

I use magick.exe to convert image files to black and white.
It is ok in 7.0.8 previously.
However, in 7.0.9, the image generated is gray scale and 256 colors (I use IrfanView to view the image information).

Here is the input png image:


In 7.0.8, I use the following command:

Code: Select all

"C:\Program Files\ImageMagick-7.0.8-Q16\magick.exe" convert test1.png -monochrome test1.magick.708.png

Output:


In 7.0.9, I use the following command:

Code: Select all

"C:\Program Files\ImageMagick-7.0.9-Q16\magick.exe" convert test1.png -monochrome test1.magick.709.png

Output:


ImageMagick version:
ImageMagick-7.0.9-7-Q16-x64-static.exe

Please advise. Thanks.

Best Regards,
Clive

[fmw42]

I can confirm the issue on both IM 6.9.10.77 and 7.0.9.7 Q16 Mac OSX

[cwong]

Thanks Fred for double checking.

[fmw42]

I assume it will be fixed along with the other reported bug about a totally black result from using -monochrome.

[cwong]

Thanks for the beta release and I have tried it.
(ImageMagick-7.0.9-8~beta20191205-Q16-x64-static.exe)

The output is black and white now.
However, the behavior for 7.0.9 is different from 7.0.8.
In 7.0.9, output images are missing some major details (which can be seen in 7.0.8 ).

The following are some examples.
For Test 3, the table borders are missing.
For Test 4, the left side text is missing.

Is it possible to resume the behavior in 7.0.8?
(or add parameter in magick.exe command line to control this so that we can get back the output behavior in 7.0.8?)

Please advise. Thank you!

Best Regards,
Clive


Test 1
Test1 Input:


Test1 Output (7.0.8 ):


Test1 Output (7.0.9):


Test 2
Test2 Input:


Test 2 Output (7.0.8 ):


Test 2 Output (7.0.9):


Test 3
Test 3 Input:


Test 3 Output (7.0.8 ):


Test 3 Output (7.0.9):


Test 4
Test 4 Input:


Test 4 Output (7.0.8 ):


Test 4 Output (7.0.9):