Hi!
I'm compressing jpgs with C# in the standard way, and I had to
realize, that the quality is pretty poor.
I'd like to switch to a 4:4:4 compression (Y:U:V)
I couldn't find anything on the web to change the standard encoder to
do that. Is there any other dotNet library that I can use to encode my
jpegs?

Thanks!

<butch77 (AT) web (DOT) de> wrote

You can change the quality. Have a look in help, or search google on
EncoderParameter and Encoder.Quality. I can't remember the exact code but it
is not complicated. The thing to be careful of is that you have to pass the
quality in as a Long, not an int otherwise it will fail silently.

Michael

As Michael points out the quality is modifiable but this only acts on the
compression ratio.

To more specifically answer your question, unfortunately you can only save
to the same basic JPEG format. The encoders will read some of the more
esoteric formats including CMYK but saving to them is not possible.

--
--
Bob Powell [MVP]
Visual C#, System.Drawing

Ramuseco Limited .NET consulting
http://www.ramuseco.com

Find great Windows Forms articles in Windows Forms Tips and Tricks
http://www.bobpowell.net/tipstricks.htm

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<butch77 (AT) web (DOT) de> wrote

On Oct 30, 5:09 am, "Bob Powell [MVP]" <b... (AT) spamkillerbobpowell (DOT) net>
wrote:

So Is there any good third party library, where you cab choose more
options for saving JPEGs?

To be honest I only concern myself with MS technologies.

Michael, any suggestions?

--
Bob Powell [MVP]
Visual C#, System.Drawing

Ramuseco Limited .NET consulting
http://www.ramuseco.com

Find great Windows Forms articles in Windows Forms Tips and Tricks
http://www.bobpowell.net/tipstricks.htm

Answer those GDI+ questions with the GDI+ FAQ
http://www.bobpowell.net/faqmain.htm

All new articles provide code in C# and VB.NET.
Subscribe to the RSS feeds provided and never miss a new article.





butch77 (AT) web (DOT) de wrote:

"Bob Powell [MVP]" <bob (AT) _spamkiller_bobpowell (DOT) net> wrote

I'm the same, I was tempted to use third party tools but ended up doing
everything myself. Leadtools has a dot net library that I'm sure would give
you greater functionality.

Michael

"Bob Powell [MVP]" <bob (AT) _spamkiller_bobpowell (DOT) net> wrote

I should add that when I needed some imaging functionality that dot net
didn't support (eg Twain) I searched google which usually lead me to samples
at code project. Most of the time the samples were fairly incomplete but a
great starting point. It's quite possible that GDI+ supports the compression
required by Butch77 but is not exposed by dot net. Although with the time I
spent it's likely that the cheaper option would have been third party tools,
but they are not always perfect either.

Michael