I have an image – a matrix of RGBs. The number of pixels is relatively small (e.g. 20×20), so I want to plot it as an array of colored squares. This way the dimensions of the resulting figure won’t be dictated by the low resolution of the image. I think I need a combination of this and this , but I’…

This feature was added with the latest (0.3.7) release of PGFPlotsX, with worked example in the manual.

[image] yakir12: I think I need a combination of this and this , but I’m not sure. I am not sure what you mean by a combination. If you are asking for section 4.6.7 (Surface Plots with Explicit Color) in the pgfplots manual, this we don’t currently support. You can work around it with eg us…

Opened an issue for discussion of supporting this directly: https://github.com/KristofferC/PGFPlotsX.jl/issues/153

[image] Tamas_Papp: work around That’s perfect, thank you!

I am happy that it solves your immediate problem. I also plan to add this feature soon, after some discussion. pgfplots (the LaTeX package) is so feature-rich (with a 500+ page manual) that we have not covered all possible constructs in PGFPlotsX, but try to add them on demand.

I personally find PGFPlots really useful for publication-quality figures. The fact it’s so feature rich means I can do almost anything I want, which is also horrible in its own right… PGFPlotsX is therefore ultra useful, I bet adjusting a Julia-dialect API for PGFPlots and TikZ is really tricky…

@Tamas_Papp , I can’t get rid of the flipped y-axis, I tried with y_dir=normal (and reverse just in case) and it’s still flipped… I guess that does fit with the standard of images where the top left corner is (0,0), but… Any way I can have the y-axis (and corresponding data) go from small to large?

Please refer to the pgfplots manual, in particular matrix plot* in 4.6.12. Eg using PGFPlotsX, Colors img = rand(RGB{Float64}, 20, 20) xy = Pair.(1:20, (1:20)') col2tex(c) = "rgb=$(red(c)),$(green(c)),$(blue(c))" c = Coordinates(vec(first.(xy)), vec(last.(xy)); meta = [col2tex(c) fo…

PGFPlotsX a matrix of RGB

Specific Domains Visualization

Topic		Replies	Views
How to plot a matrix of colors Visualization	6	3425	June 23, 2020
Save Matrix of RGB Values to Image File with Huge Pixels New to Julia plotting	10	1828	October 19, 2020
Pgfplotsx, plots: non-uniform colormaps only partially implemented Visualization question , plotting , pgfplotsx	15	1140	October 2, 2020
Heatmap plots with X and Y matrix instead of vectors Visualization plotting	22	3369	November 3, 2022
How to make a heatmap with pgfplotsx? Visualization pgfplotsx	4	1327	June 27, 2026

PGFPlotsX a matrix of RGB

Related topics