ulfis@nada.kth.se (Anders Ulfheden) (01/20/89)
I have a problem: If I design a picture in PostScript I'll make the design at the largest possible scale, so that the picture will fit on a paper. When I want to use my picture, for example a logo, I reduce the scale to get the correct size and print it on the LaserWriter. Now, unfortunately, my lines and paths are blurred together so that you can't see finer details of the logo. Next step is to use a scanner and scan the full-scale logo to a bitmap and send it to the printer at reduced scale. Now it looks good!?! Is there any way to manipulate scaling and/or something else to get the same result with my PostScript picture???? PS: I use Adobe Illustrator 88 as a designing tool DS. +------------------------------------------------------------------------------ | Anders Ulfheden | USENET: ulfis@nada.kth.se | Royal Institute of Technology | Stockholm, Sweden
liam@cs.qmc.ac.uk (William Roberts) (01/25/89)
The difference between the difference between printing white and not printing anything. PostScript does the best it can with the device resolution it's got: in particular, very thin lines will get slightly thicker if they are down at the sub-pixel size. This applies whichever coolur is being used, and so if you want a "picture frame" effect with a thick black line, a thin white line and a thin black line. e.g. BBBBBBBBBBB BBBBBBBBBBB wwwwwwwwwww BBBBBBBBBBB then the most "size independent" way of doing it is to print a width 4 black line, with a width 1 white line on top. When this is drawn small, the white line is the one which gets the benefit of rounding up to pixel size. If this is drawn realy small, the white line will eventually completely obscure the black line. With the bitmap, all of the black and white pixels are draw simultaneously, so they all get an equal chance of affecting any given pixel (plus there might be some special purpose handling since bitmaps are so well defined) and you get a balance between the black and white. What you do about this difference is another matter - even doing some scaling inside Illustrator won't actually fix the problem of rendering things successively. This is intriguing because it is a further extension of the separation of description from rendering: the notion of path allows you to describe a single path and then render it in one colour, but the bitmap allows you to describe in lots of colours and then render as one operation. -- William Roberts ARPA: liam@cs.qmc.ac.uk (gw: cs.ucl.edu) Queen Mary College UUCP: liam@qmc-cs.UUCP LONDON, UK Tel: 01-975 5250