[4.2.0] Fatal error: Unsupported bit depth: 16

[jpmckearin]

This is a weird issue, and after searching issues/pr's and getting no results, I'm stumped.

My png images are, in fact, 16 bit. But I don't understand why that wouldn't be supported. I must be missing something.

Grunt Config

sprite: {
    all: {
        src: '<%= yeoman.app %>/images/sprites/*.png',
        dest: '<%= yeoman.app %>/images/sprites/css/spritesheet.png',
        destCss: '<%= yeoman.app %>/images/sprites/css/sprites.css',
        cssOpts: {
            'cssClass': function (item) {
                return '.sprite-' + item.name;
            }
        }
    }
}

[jpmckearin]

After further evaluation, we found that there was a 64x64 png that caused the issue. It was a holdover icon from a previous version of the system so we just removed it and all is now well. Does anyone mind explaining the occurrence?

[twolfson]

The default spritesmith engine is JS based and lacks the complete functionality of other parsing engines. At this point, it does not currently support 16 bit depth PNGs:

darkskyapp/pngparse#6

There are other issues related to the parser not being fully supportive, #80 and #109. However, you are the first one to report 16 bit PNG issues.

For anyone else who has this issue and cannot remove the image, please see the advice from #109:

#109 (comment)

[jpmckearin]

Thanks @twolfson