I'm using DSpace 1.4, and don't have the option to upgrade at the
moment, so hopefully someone can help me with the older version.
I'm having a hard time trying to figure out how to make decent-looking
previews and thumbnails. This particular collection I'm working on is a
bunch of scans of black-and-white photographs, in TIFF format. I've got
the jai-imageio libraries installed and added TIFF to the JPEGFilter and
BrandedPreviewJPEGFilter inputFormats. The filter-media script is
creating the thumbnails and previews, but they just look like snow.
I'm not rally a java person, so after a little Googling I tried
specifying different combinations of interpolation, dithering, and
rendering values in JPEGFilter.java, for example:
<...>
import java.awt.RenderingHints;
<...>
// now render the image into the thumbnail buffer
Graphics2D g2d = thumbnail.createGraphics();
g2d.setRenderingHint(RenderingHints.KEY_INTERPOLATION,
RenderingHints.VALUE_INTERPOLATION_BICUBIC);
g2d.setRenderingHint(RenderingHints.KEY_RENDERING,
RenderingHints.VALUE_RENDER_QUALITY);
g2d.setRenderingHint(RenderingHints.KEY_DITHERING,
RenderingHints.VALUE_DITHER_DISABLE);
g2d.drawImage(buf, 0, 0, (int) xsize, (int) ysize, null);
<...>
But the resulting previews and thumbnails always look like snow. I just
don't know where or how to specify a different resampling method.
Examples:
This is actually a JPG scaled down in Gimp, to get the idea of the
original 44MB TIFF:
http://rocky.uta.edu/grimland/images/orig.jpg
This is the preview JPG crated by MediaFilterManager:
http://rocky.uta.edu/grimland/images/preview.jpg
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