XnView Software

Hello

I'm writing a small utility in Delphi 5 that converts BMP toolbar images I've created in various ways. As you probably know the colour bottom left pixel defines what counts as transparent. I use RGB FF00FF, so all pixels that are that colour apear transparent in the toolbar.

The first test programs I thought I'd try was to convert the BMP to a transparent GIF and then another to convert it to a transparent PNG. However, unlike GflAx, there doesn't seem to be maskcolor or usetransparency (at least they're not defined in libgfl.pas) so I can't make the BMP background color truly transparent before saving.

The closest thing I saw was TransparentIndex, but I assume that's the index in to a colour palette which won't work.

So is there any way to do this? If not could you add it to your to-do list for the next version please.

Thanks

Marc

mkeeley wrote:Hello

I'm writing a small utility in Delphi 5 that converts BMP toolbar images I've created in various ways. As you probably know the colour bottom left pixel defines what counts as transparent. I use RGB FF00FF, so all pixels that are that colour apear transparent in the toolbar.

The first test programs I thought I'd try was to convert the BMP to a transparent GIF and then another to convert it to a transparent PNG. However, unlike GflAx, there doesn't seem to be maskcolor or usetransparency (at least they're not defined in libgfl.pas) so I can't make the BMP background color truly transparent before saving.

The closest thing I saw was TransparentIndex, but I assume that's the index in to a colour palette which won't work.

So is there any way to do this? If not could you add it to your to-do list for the next version please.

Thanks

Marc

You must change the GFL_BITMAP::TransparentIndex

Hello

Don't understand how I'd use TransparentIndex. I assume it's the index in to the colour palette for the transparency colour. However how do I work out what to set it to, my background as usual is #ff00ff.

Also, by default, the BMP's are 24bit but TransparentIndex is only a Int16 (although they're 24 bit not that many colours will be used, not usually more than 500-1000) would that cause a problem?

Thanks

Marc

mkeeley wrote:Hello

Don't understand how I'd use TransparentIndex. I assume it's the index in to the colour palette for the transparency colour. However how do I work out what to set it to, my background as usual is #ff00ff.

Also, by default, the BMP's are 24bit but TransparentIndex is only a Int16 (although they're 24 bit not that many colours will be used, not usually more than 500-1000) would that cause a problem?

Ok, right there is no Mask function like GflAX, do you want such function in GFL?

It would be really handy. As that way, as you said, you can mask things off and manipulate just the image.

Marc