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https://issues.apache.org/jira/browse/FOP-2309?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13808636#comment-13808636
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James Burton commented on FOP-2309:
-----------------------------------
Forgot to mention, I was trying to decrease the data going to the printer by
converting from 24 rgb based image to palette base image (1, 2, 4 or 8 bit).
In the patch, in the large chunk of commented out code you will find color
counting and then setting up a palette based image and rendering to it. But
no matter what I do, it always dithers. I tried setting hints, but to no
avail. My awt knowledge is limited. Any suggestions would be appreciated.
The swt version I wrote a while back works fine. See below.
....if (colors<=256)
{
int depth=1;
for ( ; colors>(1<<depth); )
depth*=2;
int max_colors=1<<depth;
RGB[] new_rgb = new RGB[max_colors];
int i;
for (i=0; i<colors; i++)
new_rgb[i]=rgb[i];
for ( ; i<max_colors; i++)
new_rgb[i]=new RGB(255,255,255);
final PaletteData palette = new PaletteData(new_rgb);
ImageData new_data = new ImageData(imageData.width,
imageData.height, depth, palette);
Image new_image = new Image(Display.getDefault(), new_data);
Transform t = new Transform(new_image.getDevice());
t.translate(-leftClip, 0);
GC gc = new GC(new_image);
gc.setTransform(t);
gc.drawImage(image, 0, 0);
t.dispose();
gc.dispose();
renderImage(new_image.getImageData(), 0, dpi);
new_image.dispose();
} ...
> [PATCH] Unfinished PCL Color printing patch
> -------------------------------------------
>
> Key: FOP-2309
> URL: https://issues.apache.org/jira/browse/FOP-2309
> Project: Fop
> Issue Type: Improvement
> Components: pcl, svg
> Affects Versions: 1.1
> Environment: I'm currently testing in windows only, but should apply
> to all
> Reporter: James Burton
> Labels: patch
> Fix For: 1.1
>
> Attachments: ColorDuplexSVG.fop, FOP_1.1_colorPCL.patch
>
>
> This patch adds the following:
> - Supports color printing
> - Replaces the run-length compression routine with one that will try
> run-length, tagged image file format, delta row and if need be unencoded,
> which ever is smallest.
> - Handles images set to the left of the printable area, it will clip the
> image by not sending down those bits.
> The code currently has these issues (and would love suggestions on how to do
> it):
> - Need a way to specify if the printer supports color. You will get
> garbage if you send color commands to an old black and white printer
> (although most newer black and white printers will emulate color with
> greyscale). It is currently controlled in the code with this line "final
> boolean printerSupportsColor=true;"
> - Color images are currently not scaled. This is because the application
> I'm writing only expects FOP files with SVG. And SVG is always rendered to a
> 300 dpi 24 bit color image before being sent to the PCL module. This works
> for me.
> - Should have a attribute for setting speed vs size of PCL output.
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