I am trying to use iconutil to generate icns file from iconset directory. If the icon set directory contains the required file in png format, it works. If it contains the required files in jpg format, I get
/private/tmp/MyIcon.iconset:warning: No image found for point size: 16 at scale: 1.
/private/tmp/MyIcon.iconset:warning: No image found for point size: 16 at scale: 2.
/private/tmp/MyIcon.iconset:warning: No image found for point size: 32 at scale: 1.
/private/tmp/MyIcon.iconset:warning: No image found for point size: 32 at scale: 2.
/private/tmp/MyIcon.iconset:warning: No image found for point size: 128 at scale: 1.
/private/tmp/MyIcon.iconset:warning: No image found for point size: 128 at scale: 2.
/private/tmp/MyIcon.iconset:warning: No image found for point size: 256 at scale: 1.
/private/tmp/MyIcon.iconset:warning: No image found for point size: 256 at scale: 2.
/private/tmp/MyIcon.iconset:warning: No image found for point size: 512 at scale: 1.
/private/tmp/MyIcon.iconset:warning: No image found for point size: 512 at scale: 2.
/private/tmp/MyIcon.iconset:error: Invalid iconset, no resources found in iconset.
MyIcon.iconset:error: Failed to generate ICNS.
Yet, the directory has these images
4190 21 Aug 16:31 icon_128x128.jpg
4958 21 Aug 16:31 [email protected]
3938 21 Aug 16:31 icon_16x16.jpg
3950 21 Aug 16:31 [email protected]
4958 21 Aug 16:31 icon_256x256.jpg
8030 21 Aug 16:31 [email protected]
3950 21 Aug 16:31 icon_32x32.jpg
3998 21 Aug 16:31 [email protected]
8030 21 Aug 16:31 icon_512x512.jpg
32606 21 Aug 16:31 [email protected]