Transparency problem with GIFEncoder? Maybe it's me?

Hello László,

thank you very much for your nice two class : GIFDecoder & GIFEncoder!
It's very cool and useful, congratulations!

So I'm using the GIFDecoder class and it's OK to get the frames and the delay for each frame. Nice work!
But when I want to rebuild a gif with these frames I encounter sometimes a trouble with GIFEncoder. It depends on the gif I have decoded.

I've tested with the file example.gif (el barto):
1. use GIFDecoder on this file: its' OK and I get the 17 frames.
2. use GIFEncoder on the 17 frames. Not OK. The generated image seems to be a list of single pics, not really a merge.

I uploaded those files for the demo :
1. The original file I used
img77.imageshack.us/img77/5472/exam ...

2. The new file I've generate with GIFEncoder (I used the 17 frames I get with GIFDecoder )
img523.imageshack.us/img523/752/exa ...

Maybe is it the transparency bug ? Or may be I've done an error?
Thank you vey much if you (or someone) may explain what is the problem.

regards,

ps: sorry for my not very good english. Tell me if you don't understand very well my post, Thank you.

--
Laurent

Hi,

Your English knowledge is good and what is more it's better than my English knowledge, I understand whatever you mean perfectly:)
I will review your problem, but if you can please send me a completely example here: laszlo.zsidi@ge.com

Thank you,

László

It's a very interesting anomaly.
Thought the assebled first and the last frame have a difference background color than the more frames!?
Try to disassemble the oroginal animated image and be sure the bg. color of the first and the last frame.

Hi László,

thank you very much for your answer!

This is the complete example you asked for. I hope that it can help you.

I tested 2 files:
- exemple.gif : bg. color of the first and the last frame seem to be the same.
- ribbon.gif : bg color of the first and the last frame are different.

Here I post links to initial file, rebuild file and capture of all the frames I get.

----------------------------------------------------

* exemple.gif initial:
img77.imageshack.us/img77/5472/exam ...

* exemple.gif frames with GIFDecoder:
img75.imageshack.us/img75/8122/bart ...

* exemple.gif rebuilt with GIFEncoder:
img523.imageshack.us/img523/752/exa ...


* ribbon.gif initial:
img511.imageshack.us/img511/6251/ri ...

* ribbon.gif frames with GIFDecoder:
img511.imageshack.us/img511/7586/ri ...

* ribbon.gif rebuilt with GIFEncoder:
img131.imageshack.us/img131/4003/ri ...

----------------------------------------------------

I wonder if you get the same frames I get?

Ask me for any info you need.

Thank you,

regards,

--
Laurent

Hi László

I have the same problem, and I think this comes from the evil decoder.class.php between frames when the gif is too optimized.

Is it possible to do something to fix the problem?

Thank you

soy de peru me llamo marcelo soy freelance y estoy muy agradecido por el seńor László Zsidi

Pero tengo el mismo problema del fondo blanco.

e intenado moficando el GIFEncoder.class.php reeemplazando el valor rgb 0xFF por 0x00 y no logro con poner el fondo negro

no hablo ingles, solo google traductor.

necesito colocar el fondo negro.
mi correo marcelouss@hotmail.com

______________________________________________

I'm from Peru, my name is marcelo, I'm freelance and I'm very grateful for Mr. László Zsidi

But I have the same problem with the white background.

And intentionally modifying the GIFEncoder.class.php by replacing the value rgb 0xFF by 0x00 and I do not succeed with putting the black background

I do not speak English, I just google translator.

I need to place the black background.
My email marcelouss@hotmail.com