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https://issues.apache.org/jira/browse/SANSELAN-67?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13223457#comment-13223457
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Damjan Jovanovic commented on SANSELAN-67:
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You are meant to set DPI using parameters passed to Sanselan.writeImage(), as
shown in the example below:
{code}
Map params = new HashMap();
params.put(SanselanConstants.PARAM_KEY_X_RESOLUTION, Integer.ValueOf(300));
params.put(SanselanConstants.PARAM_KEY_Y_RESOLUTION, Integer.ValueOf(300));
Sanselan.writeImage(image, outImgFile, format, params);
{code}
But this only works when writing BMP and TIFF images at the moment. I'll have
to add it to other formats like PNG as well.
> Possibility to set DPI for PNG
> ------------------------------
>
> Key: SANSELAN-67
> URL: https://issues.apache.org/jira/browse/SANSELAN-67
> Project: Commons Sanselan
> Issue Type: Question
> Components: Format: PNG
> Affects Versions: 0.97
> Environment: Any
> Reporter: VVD
>
> How I can to set DPI for PNG image?
> {code}
> File inImgFile = new File("in.png");
> File outImgFile = new File("out.png");
> BufferedImage image = Sanselan.getBufferedImage(inImgFile);
> // ImageInfo imageinfo = Sanselan.getImageInfo(inImgFile);
> // imageinfo.getPhysicalHeightDpi(): returned 300
> // imageinfo.getPhysicalWidthDpi(): returned 300
> // Sanselan.getMetadata(inImgFile): returned null
> ImageFormat format = ImageFormat.IMAGE_FORMAT_PNG;
> Sanselan.writeImage(image, outImgFile, format, params);
> // imageinfo = Sanselan.getImageInfo(outImgFile);
> // imageinfo.getPhysicalHeightDpi(): returned -1
> // imageinfo.getPhysicalWidthDpi(): returned -1
> {code}
> Thanks.
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