Posible bug - surprisingly huge icon

[fragath]

I have logo in svg format and i tried to generate icon but generated icons (ico format) are surprisingly huge. Below is what i found:

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$ for i in 16 32 64 128 256 ; do mogrify -format ico -density 600 -define icon:auto-resize=$i file.svg ; echo -n "$i " ; ll -h file.ico |  awk '{print $5}'; done
16 1,2K
32 4,2K
64 17K
128 67K
256 33K

To eliminate part with converting svg to png images i did it manually(in gimp): so i got following images and sizes

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16.png	641
32.png	1,3K
64.png	2,6K
128.png	4,6K
256.png	9,1K

i used these files to convert them to icon and i got:

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$ for i in `ls *.png` ; do convert $i $i.ico ; echo -n "$i.ico ";  ll -h $i.ico | awk '{print $5}'; done
16.png.ico 1,2K
32.png.ico 4,2K
64.png.ico 17K
128.png.ico 67K
256.png.ico 9,5K

and again icon with size=128(64 too) is surprisingly huge.

I tried to play with -compress and -quality settings but files are still quite big

Version: ImageMagick 6.8.9-9 Q16 x86_64 2017-07-31 http://www.imagemagick.org

[snibgo]

How many colours do you have in the results from IM and Gimp? If IM gives you more, try the "-colors" option.

[glennrp]

Not sure but "pngcheck -v file.ico" might help us figure out what's going on.

[fragath]

A icon created by this command:

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convert 16.png 32.png 64.png 128.png 256.png out.ico

Contains:

• 16x16, 32bit BMP
• 32x32, 32bit BMP
• 64x64, 32bit BMP
• 128x128, 32bit BMP
• 256x256, 32bit PNG

So this is a reason why that files was so big.

The question is it correct behavior of convert to do this conversion and is any way to disable it

[snibgo]

Did you try the "-colors" option? Such as "-colors 255" before the output file?