9

I have an image with alpha channel, I need to save it as 32-bit BMP. However, Microsoft Paint doesn't allow saving as 32-bit, only 24-bit. I have Photoshop CS5, but it also doesn't have the option to save as 32-bit BMP.

Any solution?

Jens Erat
  • 18,485
  • 14
  • 68
  • 80
jondinham
  • 359

2 Answers2

12

Photoshop >> Menu >> File >> Save As >> Choose format BMP in dropdown box >> Save button >> Choose 32-bit format >> OK button

However, photoshop will save the image as XRGB. In case the image has alpha channel (as ARGB), must use another tool:
http://www.qualibyte.com/pixelformer/

In Pixelformer, choose Menu >> File >> Export, Choose export file type as .bmp, Click 'Save', the following BMP options dialog should be shown, choose 32bit ARGB: enter image description here

jondinham
  • 359
1

Paint.Net supports 32-bit ARGB bitmaps via a plugin available in the Paint.Net forum.

To install the plugin:

  • exit Paint.Net
  • download the zip
  • extract the dll
  • copy the extracted dll to C:\Program Files\Paint.NET\FileTypes

As noted in the forum post, you need to rename files to *.bmpx before opening them in Paint.Net to avoid conflict with the default BMP filetype handler.

sean e
  • 2,851