How To Maintain Canvas Size When Converting Python Turtle Canvas To Bitmap

I want to convert a Python Turtle module (tkinter) canvas into a bitmap. I have followed the suggestion at 'How to convert a Python tkinter canvas postscript file to an image file

Solution 1:

If we start by analyzing the postscript contents, we see that it does a scaling by 0.7498 to the dimensions of your canvas

%%Page: 1 1
save
306.0 396.0 translate
0.7498 0.7498 scale
3 -241 translate
-244 483 moveto 239 483 lineto 239 0 lineto -244 0 lineto closepath clip newpath
gsave
grestore
gsave
0 239 moveto
0 339 lineto
1 setlinecap
1 setlinejoin
1 setlinewidth
[] 0 setdash
0.000 0.000 0.000 setrgbcolor AdjustColor
stroke
grestore
gsave
grestore
gsave
0 339 moveto
-5 330 lineto
0 332 lineto
5 330 lineto
0 339 lineto
0.000 0.000 0.000 setrgbcolor AdjustColor
eofill
0 339 moveto
-5 330 lineto
0 332 lineto
5 330 lineto
0 339 lineto
1 setlinejoin 1 setlinecap
1 setlinewidth
[] 0 setdash
0.000 0.000 0.000 setrgbcolor AdjustColor
stroke
grestore
restore showpage

After some digging done on postscript I came across a perl/Tk reference guide on postscript conversion from tkinter's canvas here

What you actually can do is to set not only colormode but also pagewidth/pageheight. This resulted in the following line being changed from

ps = cv.postscript(colormode='mono')

to

ps = cv.postscript(colormode='mono', pagewidth=wd-1, pageheight=ht-1)

Result:

If you have any questions feel free to leave a comment and I will try my best to reply!

PS:

Don't ask me about the -1 part, it wouldn't give me anything other that 501x501 pixels so I compensated for that. I do not know why it still didn't work though.