Set Colour & BW Compression for mixed multipages

Feature Requests for GdPicture.NET.
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mattewan
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Joined: Fri Apr 03, 2009 5:58 pm

Set Colour & BW Compression for mixed multipages

Post by mattewan » Wed May 26, 2010 12:00 pm

Hello Loic,

Would it be possible to have something like:

oGDPicture.setColorCompression = "JPEG"
oGDPicture.setBWCompression = "CCITT4"

then make a call to:

oGdPicture.TiffSaveAsMultiPageFile(ImageID1, "multipage.tif", TiffCompression.TiffCompressionAUTO)

As we dont want to use LZW compression for colour pages.

Kind Regards,

Matthew Jones

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Loïc
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Re: Set Colour & BW Compression for mixed multipages

Post by Loïc » Fri Jul 30, 2010 12:03 pm

Hi Matthieu,

Currently bitonal images are encoded in CCITT4 using the Auto compression mode and colour in LZW.

To use JPEG you have to specify JPEG compression.

Now if you want to have a multipage with CCITT4 compression for bitonal image and JPEG for color we do not provide this feature for now. This should be introduced in a medium release of GdPciture.NET 7.

Kind regards,

Loïc

Ezio
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Joined: Thu Apr 09, 2009 5:17 pm

Re: Set Colour & BW Compression for mixed multipages

Post by Ezio » Mon Feb 07, 2011 7:08 pm

Hello Loic,
are there some news about this argument?
are you planning to implement a TIFF compression scheme using CCITT Gr4 for BW images and JPEG for color images?
this is a MUST for common document capture applications.
LZW is not suitable for real application.
Using LZW compression produce large image file.

Kind regards,
Ezio

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Loïc
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Re: Set Colour & BW Compression for mixed multipages

Post by Loïc » Tue Feb 08, 2011 5:42 pm

Hi Ezio,

Unfortunately we did not get any progress on this. We concentrate our efforts on other features.
For doc. capture application we suggest PDF format. With GdPicture you can compress colour image in JPEG and bitonal image in JBIG2.

Kind regards,

Loïc

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