On Wed, Sep 08, 2010 at 08:40:34PM +0200, Jon Nordby wrote: > In the longer term the situation will hopefully be improved by > thumbnailers being more widespread, and full-image fallback for OpenRaster > with good viewer support.
I see the need for screen-resolution ORA viewers getting more pressing. I wish I had one myself, I'm abusing MyPaint for that sometimes. Other users ask for a commandline tool to convert to png/jpeg. I have just spent some days to optimize MyPaint saving time[1]. You can guess how I feel about encoding another PNG of the full image size. A typical MyPaint ORA in my collection contains two full-resolution PNGs: background.png and layer000.png. The background pattern compresses well, 90% of the file size comes from layer000.png. 70% of the saving time is spent for layer000.png. If we choose to always include a full-resolution fallback, we would almost double file size and saving time for such images. The extra PNG is less of a burden only if the image structure is more complex and overlapping. We want to make the image viewer's job easy and reliable, or else they will hardly bother to add support. ORA fallbacks are still not specified, making it impossible to implement a full-resolution ORA renderer that will not screw up in the future. I don't expect an ORA viewer to implement many blending modes (if at all), nor to render a tiled pattern. But would it be asking too much to do an OVER composition? Is this just a MyPaint specific problem, or is my reasoning true for the needs of other programs? (If we go that way, it would be ellegant to make whatever the fullscreen renderer does part of the not-yet-specified fallback mechanism.) > Though I guess if I want it to happen, I will probably have to do it > myself... Of course, the only way to be sure something gets done. [1] if anyone is interested, I can now reccommend this: png_set_filter(png_ptr, 0, PNG_FILTER_SUB); // speedup 2x, same size (for brushwork) png_set_compression_level(png_ptr, 2); // size/speed tradeoff -- Martin Renold _______________________________________________ CREATE mailing list [email protected] http://lists.freedesktop.org/mailman/listinfo/create
