Alpha channel detection

[Guest]

Hi,

is there any chance to use NConvert to detect whether or not an an alpha channel is stored in a certain image file? For example, I want to start NConvert and use
- a jpg file (cannot store an alpha channel)
- a png file (having an alpha channel)
- ...
to see if the image(s) contain(s) alpha (transparency) information.

I've read the built-in help file, but can't find what I'm looking for.

Thanks in advance!

[xnview]

Hi,

is there any chance to use NConvert to detect whether or not an an alpha channel is stored in a certain image file? For example, I want to start NConvert and use
- a jpg file (cannot store an alpha channel)
- a png file (having an alpha channel)
- ...
to see if the image(s) contain(s) alpha (transparency) information.

I've read the built-in help file, but can't find what I'm looking for.

Thanks in advance!

Perhaps if you use -info

[chronicsmoke]

Thanks for the tip. "-info" was the first argument I used, but there is no direct indicator for an alpha channel. You can only use the Bitscount or Depth-value. "32" means: image contains alpha information, because the maximum number of available (RGB-)colors consumes the first 24-bit, the last 8-bit are used for the alpha channel, right?

[xnview]

Thanks for the tip. "-info" was the first argument I used, but there is no direct indicator for an alpha channel. You can only use the Bitscount or Depth-value. "32" means: image contains alpha information, because the maximum number of available (RGB-)colors consumes the first 24-bit, the last 8-bit are used for the alpha channel, right?

yes