rgba

问题 I know you can write ... background-color: #ff0000; ... if you want something that is red. And you can write ... background-color: rgba(255, 0, 0, 0.5); ... if you want something red and translucent. Is there any terse way of writing partially transparent colors in hexadecimal? I want something like: background-color: #ff000088; <--- the 88 is the alpha ... or ... background-color: #ff0000 50%; I am getting all my colors in hexadecimal, and having to convert them all to the decimal 0-255

问题 I\'m using PIL to convert a transparent PNG image uploaded with Django to a JPG file. The output looks broken. Source file Code Image.open(object.logo.path).save(\'/tmp/output.jpg\', \'JPEG\') or Image.open(object.logo.path).convert(\'RGB\').save(\'/tmp/output.png\') Result Both ways, the resulting image looks like this: Is there a way to fix this? I\'d like to have white background where the transparent background used to be. Solution Thanks to the great answers, I\'ve come up with the

问题 I am using this CSS for background opacity of a <div> : background: rgba(255, 255, 255, 0.3); It’s working fine in Firefox, but not in IE 8. How do I make it work? 回答1: Create a png which is larger than 1x1 pixel (thanks thirtydot), and which matches the transparency of your background. EDIT : to fall back for IE6+ support, you can specify bkgd chunk for the png, this is a color which will replace the true alpha transparency if it is not supported. You can fix it with gimp eg. 回答2: to