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#1 Posted : Tuesday, March 31, 2015 9:36:31 PM(UTC)

placr  
placr

Groups: Registered
Posts: 7


Hi,

I'm trying to activate Huffman algorithm on my images.

According to this document (https://www.leadtools.com/help/leadtools/v19/dicom/clib/ldicomds__setimagelist.html), i'm setting the Options.Jpeg.Save.Passes to 2.

The file size is effectively lower than without setting the option.
But the image seems to be corrupted, blur while i'm openning it with photoshop.

I joined the input image, the output without the option passes and with the option passes at 2.

Here si my code :

RasterCodecs _rasterCodecs = new RasterCodecs();
RasterImage _rasterImage = _rasterCodecs.Load(_input );
SizeCommand command = new SizeCommand();
command.Height = 445;
command.Width = 670;
command.Flags = RasterSizeFlags.Bicubic;
command.Run(_rasterImage);
_rasterCodecs.Options.Jpeg.Save.QualityFactor = 39;
_rasterCodecs.Options.Jpeg.Save.Passes = 2;

_rasterCodecs.Save(_rasterImage, filepath, RasterImageFormat.Jpeg, 24);

By the way, is there a way to just apply Huffman algorithme without doing jpg lossy comppression (like jpegtran.exe) ?

Thanks for your help.
 

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#2 Posted : Tuesday, March 31, 2015 9:37:41 PM(UTC)

placr  
placr

Groups: Registered
Posts: 7


Attachments here.
File Attachment(s):
TestHuffman.zip (2,843kb) downloaded 32 time(s).
 
#3 Posted : Thursday, April 2, 2015 6:01:48 AM(UTC)
Maen Hasan

Groups: Registered, Tech Support
Posts: 1,328

Was thanked: 1 time(s) in 1 post(s)

The following online help topic contains more accurate information about saving your images with optimized Huffman tables:
https://www.leadtools.com/help/leadtools/v19/dh/co/leadtools.codecs~leadtools.codecs.codecsjpegsaveoptions~passes.html

According to the documentation, you need to set the Codecs.Options.Jpeg.Save.Passes property to 1 to use Huffman tables.
I tested this on my side using the latest LEADTOOLS v19 .Dotnet4 DLLs and got a smaller size for the output file (I am attaching the result image that I got on my side).

Please try to set the Passes property to 1, and let me know if you face any problem.

Thanks,
Maen Badwan
LEADTOOLS Technical Support
Maen Hasan attached the following image(s):
Res_PAss_1.jpg
 
#4 Posted : Monday, April 6, 2015 11:32:47 PM(UTC)

placr  
placr

Groups: Registered
Posts: 7


Thanks for your help, it's working !

Edited by moderator Thursday, March 23, 2017 3:45:34 PM(UTC)  | Reason: Not specified

 
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