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Subject: RE: [cgmo-webcgm] One more idea for WebCGM 2.0...
- -----Original Message-----
- From: Dieter Weidenbrueck [mailto:dieter@itedo.com]
- Sent: Montag, 5. Juli 2004 10:35
- To: CGM Open Technical Committee
- Subject: [cgmo-webcgm] One more idea for WebCGM 2.0...
- I suggest that we consider one more addition to WebCGM 2.0, which is the addition of a preview image in a separate picture.
- ATA already allows for this, and I think it is a good thing to do. Users want to catalog CGM files in databases, and we are often
- asked for thumbnails or preview images.
- The picture could use a reserved name, e.g. "Preview Image".
- Thoughts?
- There shall be 1 illustration per metafile.
- For reduced raster resolution images of first
- picture additional pictures are allowed.
- Reduced raster resolution images shall have
- the picture identifier of the first picture con
- catenated with the string RRn, where n is
- the reduced resolution image number. For
- symbol library metafiles, an unlimited
- number of pictures is allowed.
Hi Ulrich,
if we provide a picture that is encoded in a predictable and simply-to understand way (only tiled raster, only one compression, preferably png for color, g4 for b/w), then a simple application could extract this image for thumbnail use.
Also, it becomes possible to show this image in a preview dialog of a file open dialog without having to parse the entire CGM.
The benefit is that on a web page showing hundreds of thumbnails you don't have to use hundreds of viewer instances. You could extract the images and store them on a server.
I guess it would also be possible to extract the preview on the fly, however, that would require download of the whole file anyway, so it is not an advantage timewise.
- -----Original Message-----
- From: Ulrich Laesche [mailto:ulrich@ematek.de]
- Sent: Monday, July 05, 2004 1:59 PM
- To: dieter@itedo.com; CGM Open Technical Committee
- Subject: RE: [cgmo-webcgm] One more idea for WebCGM 2.0...
- Dieter,
- what would be the difference between rendering a CGM image twice (as a preview image and as a full view) and your idea? In MetaWeb, we offer an option to get rid of the tool- and scrollbars when displaying a CGM file in a very small window (i.e., preview). In our JAVA solution eReview we generate small PNGs on-the-fly if a customer requests thumbnail display. In both approaches links are added from the thumbnail (CGM or PNG) to the original view. Is it the latter approach you envision?
- Regards
- Ulrich
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