You are viewing a plain text version of this content. The canonical link for it is here.

Posted to batik-users@xmlgraphics.apache.org by Alps <al...@c-sam.co.in> on 2006/06/16 11:06:44 UTC

GIF Transcoding and Transcoding Hints.

Hi all, 

I am using Batik for following purpose:
1. Transcoding to different possible formats like JPEG/PNG with Affine
transformation.

Is there some way to transcode existing SVG image to GIF format ? Also in
Java 2D graphics, i found several rendering hints used during image format
transformation like Rendering quality, color quality, anti aliasing,
dithering, Interpolation for scaling algorithms. I relate the transcoding to
image rendering but found such hints missing for a configurable transcoding.
Can we specify such hints specially like interpolation, quality, size using
Batik core modules or some other way.

Please correct me if i am wrong, 

Thanks..Alps.

--
View this message in context: http://www.nabble.com/GIF-Transcoding-and-Transcoding-Hints.-t1797093.html#a4897257
Sent from the Batik - Users forum at Nabble.com.


---------------------------------------------------------------------
To unsubscribe, e-mail: batik-users-unsubscribe@xmlgraphics.apache.org
For additional commands, e-mail: batik-users-help@xmlgraphics.apache.org

Re: GIF .... + Image Size Compression and Quality Control.

Posted by Alps <al...@c-sam.co.in>.

Hi,

Thanks thomas for the reply,

As described, i m using Batik+java2D for transcoding SVG images to different
formats - JPEG/PNG/GIF/BMP. During process, i found the image (PNG &JPEG)
size increased badly and quality failed too. The images i am working on are
within RGB color space with some gradience. For maintaining the quality and
decrease optimal size, i tried the following approaches:

1. SVG document rendering properties - this did not proved useful in my case

2. java2D Rendering hints like INTERPOLATION, RENDERING - when applied to
BufferedImage creation from a SVG document, this helped in image size
reduction irrespective of further encoding params.

3. BufferedImage encoding params (JpegEncodeParam, PngEncodeParam) - i found
default encoder (PNGEncoder/JpegEncoder..) setting optimal. Setting explicit
encoding params for size reduction with quality control, did not work like
for e.g. unsetting chromaticity, pallete etc.

+ i found the java.awt.image encoder for PNG and JPEG optimal among
available codecs.

The requirement is to still look over the image (PNG/JPEG) size reduction
but maintaining quality. Are some other ways enabling in image size
reduction and compression along with above described alternatives,

Thanks..Alps

--
View this message in context: http://www.nabble.com/GIF-Transcoding-and-Transcoding-Hints.-t1797093.html#a4968876
Sent from the Batik - Users forum at Nabble.com.

---------------------------------------------------------------------
To unsubscribe, e-mail: batik-users-unsubscribe@xmlgraphics.apache.org
For additional commands, e-mail: batik-users-help@xmlgraphics.apache.org

Re: GIF...... + Trancoded Image Quality and Size.

Posted by Alps <al...@c-sam.co.in>.

Hi,

Thanks thomas for the reply,

1. SVG document rendering properties - this did not proved useful in my case

2. java2D Rendering hints like INTERPOLATION, RENDERING - when applied to
BufferedImage creation from a SVG document, this helped in image size
reduction irrespective of further encoding params.

+ i found the java.awt.image encoder for PNG and JPEG optimal among
available codecs.

Thanks..Alps
--
View this message in context: http://www.nabble.com/GIF-Transcoding-and-Transcoding-Hints.-t1797093.html#a4968037
Sent from the Batik - Users forum at Nabble.com.

Re: GIF Transcoding and Transcoding Hints.

Posted by th...@kodak.com.

Hi Alps,

Alps <al...@c-sam.co.in> wrote on 06/16/2006 05:06:44 AM:

> I am using Batik for following purpose:
> 1. Transcoding to different possible formats like JPEG/PNG with Affine
> transformation.

> Is there some way to transcode existing SVG image to GIF format ? 

    We don't provide one, if you have access to a library that saves
GIF from a Java2D BufferedImage it shouldn't be too hard to add (take 
a look at the PNGImageTranscoder - which supports 8bit output).

> Also in Java 2D graphics, i found several rendering hints used during 
> image format transformation like Rendering quality, color quality, 
> anti aliasing, dithering, Interpolation for scaling algorithms. I 
> relate the transcoding to image rendering but found such hints missing 
> for a configurable transcoding. Can we specify such hints specially 
> like interpolation, quality, size using Batik core modules or some 
> other way.

   All of these Java 2D rendering hints are set/controlled by the
SVG rendering hint attributes:

    http://www.w3.org/TR/SVG11/painting.html#RenderingProperties

   You can add/modify these attributes in the SVG document (probably
on the root element) before giving the Document to the Batik transcoder.


---------------------------------------------------------------------
To unsubscribe, e-mail: batik-users-unsubscribe@xmlgraphics.apache.org
For additional commands, e-mail: batik-users-help@xmlgraphics.apache.org