PNG-Export - Compression level

TeeChart VCL for Borland/CodeGear/Embarcadero RAD Studio, Delphi and C++ Builder.
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Heinz
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PNG-Export - Compression level

Post by Heinz » Thu Apr 02, 2009 3:00 pm

Hi,

using the PNG-Export function there is no difference in the quality of the image and in the filesize between compression level 0 and compression level 9.

I presume this is not intended?


Best regards

Heinz

Narcís
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Post by Narcís » Mon Apr 06, 2009 1:52 pm

Hi Heinz,

We have investigated the issue here. Code seems correct and compression level is being applied correctly. It can be observed if producing much bigger and colorful images, for example a surface series with many different colors.
Best Regards,
Narcís Calvet / Development & Support
Steema Software
Avinguda Montilivi 33, 17003 Girona, Catalonia
Tel: 34 972 218 797
http://www.steema.com
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Heinz
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Post by Heinz » Thu Apr 09, 2009 11:58 am

Hi Narcis,

many thanks for checking this item and confirming that it works well.

But even for charts with many series and many different colors the difference between the compression levels is very small. So in most cases there is no advantage for the user to take a higher compression level.

Best regards

Heinz

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