Is it animated GIF ???

Anon

Hi all,

I used to desplay the images of a perticuler Directory by by browsing all the directory contents. My directory contains some Still GIF images and some Animated GIF's. So the Problem is .. how could I know that this Perticuler image is Animated??

And how much information I can featch about an perticuler image through PHP ??

Any idea ??

Thanking in anticipation

Tabish

Anon

Hi!

My guess is that you need to open those files in binary mode in a regular text editor and see if there's a different pattern in animated and regular gif images. Usually you have to look at first few bytes of the file.

Most image type getting functions just read first two-three bytes, and return the type of the image. Gif usually has GIF89 string at the beginning.

I don't really know. It seems to me the animation information may be just as well buried past those few bytes. In this case, you could use regexp to find the pattern, but as you may guess this will be quite a time-consuming process.

Best,
Stas

cordex

I was curious as to if Stanislav would be correct so I did a little checking.

This should work for most animated gifs - can't promise all, though:

Open the image as a text file
search for the strings GIF89a and NETSCAPE2
If the image just containst the string GIF89a, it's a regular gif.
If the image contains both GIF89a and NETSCAPE2, in my experience it is an animated gif.

-Ben

Anon

Hi!

I didn't do the checking when I wrote the reply yesterday. You are right - at least in the files I have at hand this rule works.

We might as well write a php function to get the type of the gif image.

But since NETSCAPE2.0 is usually on lines 2-10, this is a bit more time-consuming than just reading the mime type of the file (in which case we cannot know whether it is an animated or static gif, or cannot handle server mime-type misconfigurations).

Best,
Stas

aakesh

Even if you find the type of GIF it is (animated or otherwise), how do you get the animated ones to display "animatedly"? I'm fighting with my site right now on this.