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- Path: sparky!uunet!olivea!decwrl!access.usask.ca!telepro!James_Hastings-Trew
- From: James_Hastings-Trew@telepro.UUCP (James Hastings-Trew)
- Newsgroups: comp.sys.amiga.graphics
- Subject: Re: Converting Structured Graphics Formats
- Message-ID: <James_Hastings-Trew.0iky@telepro.UUCP>
- Date: 23 Aug 92 17:33:48 GMT
- Organization: TelePro Technologies
- Lines: 75
-
- In a message dated Sun 23 Aug 92 10:04, Ladyhawke@cup.portal.com (classic -
- wrote:
-
- L> Vector graphics conversion utilities? YES, please. And if PostScript
- L> is to be one of the formats, then I would love to see a flag or option
- L> for the format. Most developers have implemented PostScript files
- L> without the accompanying bitmap which PostScript allows so you can see
- L> the image on the screen (instead of that annoying shaded box). I'd
-
- There is no point in Amiga programs putting a preview on the end of the EPS
- files if the Amiga DTP programs won't use them. They are the people
- responsible for the lack of preview support.
-
- L> like to see it implemented in a flexible way so you can select the
- L> target platform for the PostScript file and attach the appropriate
- L> bitmap.
- L> For example, I think some of the Mac programs use TIFF as the bitmap
- L> format to accompany a PostScript file. Haven't investigated what
-
- Mac EPS files use either a Black and White or 8 bit colour PICT bitmap.
- PICT is a bitmap graphic format that is based on QuickDraw routines built
- into the Mac ROMS. IBM EPS files use a 1 bit TIFF format -- it is important
- to know that the IBM TIFF format is different from the Mac TIFF format
- because the byte-order in 16 bit words is different on Intel CPUs than it
- is on Motorolla CPUs. So far, only PageStream makes any attempt to use Mac
- EPS files (from Adobe Illustrator) to show a preview or to convert the file
- to its own internal structured graphic format.
-
- MacDraw files are structured PICT files. These again are dependent upon
- code in the Mac ROMS, and so would not be an easy thing to convert to an
- Amiga format without a LOT of work. EPS files from Illustrator or Freehand
- on the other hand are PostScript code. To convert these to a bitmap format
- would "only" require the creation of a Postscript interpreter engine.
-
- If Black Belt wants to include a Postcript interpreter into Imagemaster, I
- suggest that they take the approach that Adobe did with their Photoshop
- product -- support only one format (Illustrator) and fine-tune the
- rendering engine for that format only. Their converstion is great. You have
- the options of setting the size, resolution, colouration, and anti-aliasing
- of the final bitmapped representation. The anti-aliasing is incredible - a
- near perfect rendering of the PostScript file in whatever resolution you
- choose.
-
- L> others
- L> use. There's no reason why an image processor couldn't be set up to
- L> convert just the bitmap portion and leave the PostScript code alone.
-
- Except that the bitmap on EPS graphics are usually of very low quality,
- compared to the Postscript code itself.
-
- If people want to convert EPS graphics to bitmap format they can do so
- RIGHT NOW, for FREE. Just get POST 1.7 from the Fred Fish disks. It does
- not anti-alias, but it is a complete Postscript engine that can read just
- about any Postscript file and create a bitmap from it. The limitation is
- that it will not create a 24 bit representation of the EPS graphic - it
- only produces a 3 or 4 bitplane version of the Postscript file.
-
- If you want it to anti-alias, just make the bitmap 2x or 4x larger than you
- need it, and scale it down to size in Imagemaster (or ADPro!). It won't be
- as good as the Adobe Photoshop rendering, but it will be close.
-
- If Black Belt wants to make a general purpose structured graphics
- conversion utility, I would like to see it as a seperate product from
- Imagemaster. It should use plug-in conversion modules (a la Interchange)
- and central "engine" that uses the read/write modules to do all the dirty
- work. It will be difficult to convert Postscript's bezier curves to other
- formats that don't use them - cubic splines or many many little
- straight-line segments? It should be EASY to convert an EPS file to ProDraw
- clip format. The only problematic part (aside from getting the clip file
- specs from Gold Disk) would be what to do with features in one program that
- are not supported in another (compound objects, etc.) If done well, it
- would be a great product -- one that I would pay up to $250 for.
-
-
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