PNG Transparency while retaining black

[phpknight]

I've been searching the posts and still cannot figure out how to do this.  Here is the issue:

 

1.) If I upload a PNG and resize it, any transparent background turns black.  Many people have spotted this.

2.) Is there a way to reatain transparency AND keep black as black if the image originally has it?

 

From seraching, it appears it has something to do with imageSaveAlpha and imageColorTransparent, but I still I am not if these would fix the issue.

 

 

[php_tom]

Not sure if this is your problem, but if you're viewing the image in IE6, it doesn't support PNG transparency. See this site for a fix in JavaScript: http://homepage.ntlworld.com/bobosola.

 

Otherwise, make sure that the "save gamma" option is checked when you save your image.

[MadTechie]

before you resize (imagecopyresized)

use imagealphablending($imageFile, true);

[phpknight]

It's IE 7. 

 

So, if somebody uploaded a transparent PNG and did not save the gamma, is it going to turn black anyway in IE even though it would not in Photoshop?  Please explain.

 

MadTechnie, that alphablending will work and retain the black native to the image as well?

 

[MadTechie]

as for IE PNG, read this

[phpknight]

Okay, I will be sure to let you know if this works when I get to that part.  I am not too worried about that problem for IE6.  I no longer program for old browsers, lol.