| Summary: | bad antialiasing | ||
|---|---|---|---|
| Product: | Ghostscript | Reporter: | Attilio Drei <attilio.drei> |
| Component: | Graphics Library | Assignee: | Default assignee <ghostpdl-bugs> |
| Status: | NOTIFIED INVALID | ||
| Severity: | normal | ||
| Priority: | P4 | ||
| Version: | 8.54 | ||
| Hardware: | All | ||
| OS: | MacOS X | ||
| URL: | http://attiliodrei.no-ip.com/antialias/ | ||
| Customer: | Word Size: | --- | |
| Attachments: |
Eps file look at title when converting image at 100 dpi
eps.bz2 file: text render of Helvetica-Black is poor at 100dpi 867-100.png |
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Description
Attilio Drei
2006-09-03 18:14:57 UTC
Created attachment 2447 [details]
Eps file look at title when converting image at 100 dpi
Created attachment 2448 [details]
eps.bz2 file: text render of Helvetica-Black is poor at 100dpi
What command line are you using? The text is not present as text, i.e., not rendered with a text operator like
"show". Instead, this text is rendered by using the "charpath" operator on a
string, then setting that path as the clippath, then filling a box that includes
the text area. For example, this is the way the title is rendered:
/Helvetica-Black*1 findfont [11.7 0 0 -13 0 0 ]mfnt sfnt
84.1265 16.7446 mov
(GLI STRANIERI IN ATENEO) false chp
clp
84.5827 7.13765 mo
256.68 7.13765 li
256.68 16.9916 li
84.5827 16.9916 li
0 0 0 0 cmyk
f
----
TextAlphaBits=4 anti-aliasing only works for text. Note that even setting
GraphicsAlphaBits=4 won't have any effect on this method of rendering since
the character outline is being used as a clip path, not being filled. A clip
path is ALWAYS a "hard" outline -- never anti-aliased.
The only way to acheive anti-aliasing with this kind of file is to use GS to
render at 4 times higher resolution, then use something like 'convert' (an
imagemagick tool) to resize the image. For example:
gs -r400 -sDEVICE=png16m -o 867-400.png input.eps
convert -resize "25%" 867-400.png 867-100.png
I've attached the result and will close the bug.
Created attachment 2453 [details] 867-100.png Result from method used in comment #4. |