Convert 32-bit BMP to PNG

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Synthic
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Convert 32-bit BMP to PNG

Post by Synthic »

Sorry for asking this seemingly straightforward question, but I've been trying for so long without success

I need to convert a 32-bit BMP to PNG, preserving the alpha channel. I thought this would be straight forward

Code: Select all

Convert before.BMP after.PNG
I've also tried varius parameters such as -channel argb and so on without success.
I have a bunch of bmp's I need to batch convert through code, and I've been trying all day to do this with varius tools.
Any thoughts and help is very much appreciated!
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snibgo
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Re: Convert 32-bit BMP to PNG

Post by snibgo »

What version of IM? What platform?

Put your file somewhere like dropbox.com and paste the URL here.
snibgo's IM pages: im.snibgo.com
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fmw42
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Re: Convert 32-bit BMP to PNG

Post by fmw42 »

try

Convert before.BMP PNG32:after.PNG

If you have an older format BMP, perhaps try

Convert BMP3:before.BMP PNG32:after.PNG
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glennrp
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Re: Convert 32-bit BMP to PNG

Post by glennrp »

fmw42 wrote:If you have an older format BMP, perhaps try

Convert BMP3:before.BMP PNG32:after.PNG
The "BMPn:" prefix has no effect on the bmp decoder; it's currently only used by the encoder for selecting an output format.
Putting it in front of the input filename is harmless, though.
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