tdan on wrote...
|
| Goal: Draw a dashed border around an existing photo with known dimensions.
| Problem: My method creates a dashed border which is too thin. It does not
| appear like a border.
| Progress:
| - I drew a transparent border around the image because I did not want the
| border drawn on the image itself.
| I wanted it to act like a border or frame, hugging the image.
| - I used 4 draw commands so that the pathlines were straight and would not
| 'jump' between edges (try it with 1 path command).
|
|
| For testing try this:
| convert rose: -resize 300x200! âbackground none âborder 20 âbordercolor
none
| -strokewidth 20 âstroke blue âfill none
| -draw âstroke-dasharray 20 20 path 'M 0,0 h 300' â
| -draw âstroke-dasharray 20 20 path 'M 300,0 v 200' â
| -draw âstroke-dasharray 20 20 path 'M 300, 200 h -300' â
| -draw âstroke-dasharray 20 20 path 'M 0, 200 h -200' â
|
Couple of points...
* Ensure a transparency or matte channel exists in the image before
adding the transparent color. I think -border did this automatically
but some operators don't.
* set your "-bordercolor" before you use it with "-border"
* You do not need a "-background" color
* use normal ASCII double quotes, not the word or UTF quotes.
* You can just draw the borders using 'rectangle'
* image coordinats go from 0 to 1 less that the wimage width/height
* The lines width is centered on the line!
* Finnaly specify an output name, even if it is just "x:" for the
normal display.
Also there is a small known bug in that the 'off' lengths of the dash
array is one short. this will hopehully be fixed soon.
Here is the revised version...
convert rose: -resize 300x200\! -matte -bordercolor none -border 20
-strokewidth 20 -draw 'stroke-dasharray 20 20 stroke blue fill none
rectangle 9,9 330,230" rose_test.png
Okay with this I can see why you like to use seperate lines rather than
a rectangle, but the other points are valid.
| If you try this from the command line, you will see the dashed line really
| is not 20px wide (at least on my monitor).
| Instead, it appears offset from the image ~9 pixels or so.
of course it isn't half your line was draw outside the image borders!
| Is this an issue with SVG having different resolution than IM's native
| resolution?
It is an issue of your coordinate placement.
Anthony Thyssen ( System Programmer ) <[EMAIL PROTECTED]>
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