How to resize gif which is stored in bitmap

Question

1.00/5 (2 votes)

See more:

i tried to resize Gif image but after resizing it will not animating. i tried following code resize.

What I have tried:

LastBitImg = new Bitmap(Convert.ToInt32(FNewWidth), Convert.ToInt32(height));
                        LastBitImg = FBitImg;

Posted 30-Jan-18 2:55am

rocker_003

Updated 30-Jan-18 3:16am

Add a Solution

Comments

Leo Chapiro 30-Jan-18 9:03am

Take a look: https://www.codeproject.com/Questions/337940/Resizing-Animated-GIF

1 solution

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Jochen Arndt · Answer 1 · 2018-01-30T03:16:00

Solution 1

An animated GIF is not a single image but a sequence of images (also called frames) with additional data like the frame delay. You have to split the animated GIF into it's frame images as bitmaps, resize them, and create a new animated GIF using the original frame data.

There is an article here at CP on creating animated GIFs with .Net: NGif, Animated GIF Encoder for .NET[^].

Alternatively use an image library that supports resizing animated GIFs like ImageMagick (there is a .Net wrapper at GitHub: dlemstra/Magick.NET[^] ).

Posted 30-Jan-18 3:16am

Jochen Arndt

Comments

rocker_003 31-Jan-18 4:17am

i have stored gif image into bitmap... now how can i seperate its frames and resize one by one frames?

Jochen Arndt 31-Jan-18 4:46am

You have to extract the multiple frames of an animated GIF into multiple bitmaps.
Use Image.FrameDimensionsList() to get a list of information about the frames (the size of the list is the number of frames) where each list entry is of type FrameDimension.
Then use Image.SelectActiveFrame() to access each frame (image) and store it as bitmap.