bmp with alpha channel in png with transparent background

[Nezar]

Please excuse me for my English - full text translation online translator.

The problem is the following.
I have a lot of icons in bmp format with alpha channel.
I want them all together and converted into PNG.

I do so
convert 1.bmp 2.bmp-append 3.png
but I did not go - the alpha channel is lost
how can I solve this problem?

even a simple conversion
convert 1.bmp 2.bmp
destroys the alpha channel.

Thanks in advance

[Drarakel]

At the moment, ImageMagick supports BMP with alpha layer if the BMPs are stored with a Windows V4 or V5 header - but not if it's a BMP with V3 header. So, probably you have BMP V3 files. In that case, you will have to use another software (e.g. Gimp) to convert your files to PNG first.

[Nezar]

Pity.
Thank you for your reply.
We look forward to full support BMP

PS I created a bmp in photoshop c4 - what a such bmp version?

[Drarakel]

You could upload one of your BMP files - then we can tell you for sure.
It's also possible that your ImageMagick version is simply too old. What version do you use?