I am not sure that is true.
convert -size 100x100 gradient: grad100.png
identify -verbose grad100.png
Image: grad100.png
Format: PNG (Portable Network Graphics)
Class: DirectClass
Geometry: 100x100+0+0
Resolution: 72x72
Print size: 1.38889x1.38889
Units: Undefined
Type: Grayscale
Base type: Grayscale
Endianess: Undefined
Colorspace: RGB
Depth: 16-bit
Channel depth:
gray: 16-bit
Thus the gradient is 16-bit gray png.
convert grad100.png \( grad100.png -flip \) \( grad100.png -rotate
180 \) -combine grad100c.png
identify -verbose grad100c.png
Image: grad100c.png
Format: PNG (Portable Network Graphics)
Class: DirectClass
Geometry: 100x100+0+0
Resolution: 72x72
Print size: 1.38889x1.38889
Units: Undefined
Type: Palette
Endianess: Undefined
Colorspace: RGB
Depth: 16-bit
Channel depth:
red: 16-bit
green: 16-bit
blue: 16-bit
Thus an RGB color 16-bits per channel png
convert grad100c.png -depth 8 grad100c8.png
identify -verbose grad100c8.png
Image: grad100c8.png
Format: PNG (Portable Network Graphics)
Class: DirectClass
Geometry: 100x100+0+0
Resolution: 72x72
Print size: 1.38889x1.38889
Units: Undefined
Type: Palette
Endianess: Undefined
Colorspace: RGB
Depth: 8-bit
Channel depth:
red: 8-bit
green: 8-bit
blue: 8-bit
-depth 8 used to convert 16-bit per channel png to 8-bit per channel png
convert grad100c.png PNG24:grad100c8b.png
identify -verbose grad100c8b.png
Image: grad100c8b.png
Format: PNG (Portable Network Graphics)
Class: DirectClass
Geometry: 100x100+0+0
Resolution: 72x72
Print size: 1.38889x1.38889
Units: Undefined
Type: Palette
Endianess: Undefined
Colorspace: RGB
Depth: 8-bit
Channel depth:
red: 8-bit
green: 8-bit
blue: 8-bit
PNG24: used to convert 16-bit per channel png to 8-bit per channel png
>Thanks for the pointer. From what I see there, it seems that IM
>doesn't support 16-bit grey-scale PNG, which is fine with me since
>that's not what I wanted anyway.
>
>> also -depth 8
>
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