full alpha channel transparency. (+mp3 mpg pdf)

[aaa3]

full alpha channel transparency
i'm surprised that i couldn't found this with search expelicitly asked in a purpose made thread (was mentioned a very few times), i was expecting tons of such ones, and that it isent even in the site faq (!), i thougt of making one...

somewhere i read recently that its because iv uses bmp (dib) as an internal format. why dont u change it into tga? ppl says its simplier anyway than bmp, 1ot simplest bitmap formats internally; while bmp has its quirks.

would this be a much horrid rework job? if not too much... we'd love it... its the ONLY missing from iv lol. imo. well, ok, apng would be nice natively. but who cares absolutely not that important. and mng-crap is (maybe more than) enough via a plugin. hm... maybe improved svg support. also not imptt @all, just if we are at missing stuff.

ok, and maybe the option to disable certain formats opened when browsing through directories with next and prev buttons... 'd be much useful to dont have mp3s and mpegs pdfs et c. got opened, only when we weant them.

[Bhikkhu Pesala]

ok, and maybe the option to disable certain formats opened when browsing through directories with next and prev buttons... 'd be much useful to dont have mp3s and mpegs pdfs et c. got opened, only when we weant them.

Already possible. Check out the options available in Properties, Extensions.

[MItaly]

somewhere i read recently that its because iv uses bmp (dib) as an internal format.

DIBs theorically do not support alpha transparency, however they do support 32bpp bit depth, even if in the BITMAPINFOHEADER documentation the high byte of each DWORD is specified to be "not used". Still, it can be used internally to store the alpha value; moreover, the use of that byte as alpha value is well accepted, also because it's used by the AlphaBlend and TransparentBlt API functions. So, there's no reason to switch to TGA, which by the way would require the rewrite of a vast part of IV and of the plugins. Still, I don't know if IV and the various plugins are prepared to work a 32 bit DIB; moreover, the AlphaBlend and TransparentBlt functions are present from Windows 2000 onward, and Irfan still wants to mantain compatibility with the Windows 9x family.

[OT]Could you please avoid writing in silver? It's difficult to read on white background; thank you! [/OT]

[aaa3]

thank you all for your replies.
i see now...

(but... maybe... maintaining a separate 9x version which would only be different in this? ok it starts to feel too much i know, was just an idea and nvm

or... in a single version, having by default the old behaviour, and an option to enable rgba with a notifying text that dont do this if ure on 9x... again, i dont feel like pushing this too hard just another thought)