terminal - png2ico exporting ICO in lower quality than the original PNGs -

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i have 6 png files want bundle 1 ico file. i'd use png2ico instead of web app convertico.org's web app.

when ico produced using png2ico, quality of ico seems have dropped. below 2 images (100% view , zoomed in) comparing png2ico output (right) original png (left).

comparison of original png & png2ico's output.

comparison of original png & png2ico's output magnified.

is limitation of png2ico? can stop png2ico lowering quality? can recommend way of bundling 6 pngs 1 ico using terminal on osx?

i emailed developer of png2ico , sounds png2ico supports 256 colors isn't acceptable needed. have since discovered imagemagick can convert , bundle multiple pngs 1 ico rob w's post here.


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