Lossless image compression in C#

Question

0.00/5 (No votes)

See more:

Hi All,
I want to compress the size of jpeg images that I am using on my website, I want C# code for this. I dont want to use tools and Handlers to do it.

Posted 29-Sep-12 7:37am

hardiksince1987

Updated 17-Feb-16 18:34pm

v2

Add a Solution

Comments

[no name] 29-Sep-12 14:45pm

Did you want to reduce size of your user's profile image?

2 solutions

Solution 1

1) Why don't you take a gander at some of these code project articles:
http://www.codeproject.com/search.aspx?q=image+compression&x=5&y=9&sbo=qa[^]

2) "Does it compress image size". Of course. What would be the point to compression if no compression takes place?

Posted 29-Sep-12 7:58am

fjdiewornncalwe

Updated 29-Sep-12 7:59am

v2

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)

**Zoltán Zörgő** · Accepted Answer · 2012-09-29T08:42:00

Solution 2

You want to compress a lossy jpeg again with a lossless compression? Well, you will probably not succeed. Why? Because by definition a lossy compression will be able to compress better in general, than a lossless, since it will loose information details. So, even if the jpg compressed image itself is new set of data, and has it's own structure, you will get a bigger file in general after the second compression, or at least not smaller. In really special cases you can get smaller file at the end.
You better try to find the most suitable compression ration (quality factor) for your files. In general 65-75% is good for web page images.

Posted 29-Sep-12 8:42am

Zoltán Zörgő

Comments

hardiksince1987 29-Sep-12 18:59pm

I might have to go with 75% of the quality level. I am doing this to improve my performance grade. I am checking performance using http://gtmetrix.com. It always shows that the Image could be losslessly compressed upto 30%(more or less depending on Image). I looking for solution if you have any let me know.

Zoltán Zörgő 30-Sep-12 6:12am

It depend of your images and image sizes. It is up to you and your needs. Be aware, that not every quantilizer is as efficient as the other, thus you might get smaller file under the same conditions with Photoshop for example as with Paint (just examples). Notice also, that lossless formats like png are better for generated graphics (like charts), and jpg is better for photos. You can also make use of deferred download of images (see: http://www.appelsiini.net/projects/lazyload). If your images are not static context (not stored and server from a static folder), you can use the Etag to optimize caching.
And finally, you can fine-tune caching to minimize download traffic.