On 01/10/2020 09:05, Dang Ngoc Chan, Christophe wrote:
Hello,
De la part de P M
Envoyé : mercredi 30 septembre 2020 16:50
exact dot-coordinates, drawn as filled circles.
All pixel coordinates of such an area would have to have exactly one single
pixel value.
The resulting graphic right now is stored via: xs2bmp.
[...]
- It seems that the resulting pixels of the dot in the final image are not
equally colored.
I suspect the following thing: pixels are squares, not dots.
So it may be that xs2bmp somehow inter-/extrapolate the colours.
You then have a "leak" between the coloured pixel and its neighbours.
You may try to draw squares of the exact size of the final pixel (e.g. 1/320
width and 1/200 height of the graphical window for a 320 × 200 raster picture).
You may also try some functions from the image processing toolboxes.
Well, another approach would be to:
- use Matplot to display your image as a matrix, let's say [0:255] range.
- modify the data in the matrix to be displayed where you went to get
your "dot": like your change your data to 256
- use a colormap that is grayscale from [0:255] and has a fancy color
for 256 (blue?).
If you do this, you should get a perfect co-registration of your image
and your "overlayed" markers.
Of course, your markers will not be circular dots, just a single pixel
with what I described above, but you can also generate your own shapes
(bigger squares, crosses, ~circles), provided that you use an odd number
of pixels.
Hope it helps,
Antoine
Hope this helps
Regards
--
Christophe Dang Ngoc Chan
cd...@wanadoo.fr
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