Re: [PHP] imagecreate() question

Did you try making it transparent first, before adding the circle?


Only a question because I'm not sure if it will make a difference. I know I had problems trying to get the alpha blending to actually look decent in png's (ended up looking like a very poor gif with a non- antialiased mask) and I think I eventually gave up and put the image on a white background.

But that was six months to a year ago and anything more than two weeks out is all but forgotten, old-timers disease I think.

Ed

On Apr 2, 2007, at 12:26 PM, tedd wrote:

At 4:27 PM +0100 4/2/07, Richard Davey wrote:
tedd wrote:

In the php manual it says:

imagecreate() returns an image identifier representing a blank image of specified size.
We recommend the use of imagecreatetruecolor().

Q: Why the recommendation?

Because the need to create 256 colour (or less) images grows less year by year. If you need to work with a jpeg/png then imagecreatetruecolor() is required. As this is what most people need, hence the manual comment exists.

imagecreate() returns a "blank" page whereas imagecreatetruecolor () returns a "black" page.

Sure, but both are easily changed.

Cheers,

Rich

I found, which generated my questions, that the difference between a "blank" page and a "black" page can be significant when dealing with alpha channels.

For example, if I create a "blank" page and then place a 50 percent transparent circle on it, it works. However if I do the same thing using a "black" page and change the color black to transparent, I lose the 50 percent transparency of the circle. In other words, it generates a transparent page with a nontransparent circle.

If anyone knows how to use imagecreatetruecolor() to create a png image that has a 100% transparent background with a 50% transparent circle on it, I sure would like to see how you did it.

Cheers,

tedd

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