It should be quite a simple job to adjust the black point for a bitmap to make any shade of grey truly black. It you have a bitmap editor with a levels control, you can adjust the end points of the black-white range of image. At the extreme you can compress the entire brightness range into just black and white (no grey in between), but with a small range you can get a grey scale scan looking pretty black and white. Footleg On Tue, 19 May 2015 07:35 Bruce <bruce@tomo.co.nz> wrote:
Thanks for asking that question Michael I have the same problem, but I had not bothered to think about changing the linework colour.
I just tried a simpler approach (that leaves the header and grid coordinates black). I will use this from now on.
symbol-colour group all [60] #makes everything grey colour map-fg [97 86 38] #add some colour
And check out this code to make the grid grey
http://therion.speleo.sk/wiki/doku.php/metapost?s[]=change&s[]=grid&s[]=symb ols#special_symbol_examples <http://therion.speleo.sk/wiki/doku.php/metapost?s[]=change&s[]=grid&s[]=symbols#special_symbol_examples> Code to change grid symbols from cross hairs to continuous lines
Thanks Bruce (I don't know how to change the pen colours)
-----Original Message----- From: therion-bounces@speleo.sk [mailto:therion-bounces@speleo.sk] On Behalf Of Michael Wasmund Sent: Tuesday, 19 May 2015 12:00 p.m. To: therion@speleo.sk Subject: [Therion] Redefining PENA...PEND to draw lighter
Hello, Does someone have metapost code to redefine PENA...PEND to draw grey instead of black?
Why I need this:
My survey consists of 80% scanned bitmaps and 20% drawn scraps. The bitmaps are "grey", not black (can't make them better using image processing). The drawn scraps then stand out and look ugly compared to the bitmaps.
I know how to redefine individual symbols (walls etc.) to be grey instead of black, but rather than redefining a large symbol set I'd rather redefine the PENs - if possible.
Regards, Michael.
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