1
$\begingroup$

I have a picture that saved in ".mat" format. I am interested in plotting it with WL. But I get an empty image

oPic = Import["img.mat", "Data"];
Image[oPic]

oPic = 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};
$\endgroup$
  • $\begingroup$ This may be a stupid answer, but it seems to me that those numbers are intensity values of a matrix. Have you tried ListDensityPlot[oPic, PlotRange -> All] ? It gives a reasonable output (or at list, it seems something that could make sense :D ) $\endgroup$ – Fraccalo Jul 2 '18 at 8:46
  • 5
    $\begingroup$ oPic dimensions is {1, n, m} so you need to e.g. drop the first one. Then adjust values and it will work: ImageAdjust @ Image @ First @ oPic - is that what you are after? $\endgroup$ – Kuba Jul 2 '18 at 8:50
  • $\begingroup$ @Fraccalo it is work, but the result is wrong, the original picture is black-white, and the outcome of our approach is a color image. @ Kuba thank you a lot; it is work. Before I post the question, I flattened the data, but not adjust the values. Why I have to adjust values of a matrix? $\endgroup$ – Kiril Danilchenko Jul 2 '18 at 9:00
  • 3
    $\begingroup$ Updating my comment, a more nice output is obtained with: ListDensityPlot[oPic, PlotRange -> All, ColorFunction -> GrayLevel, InterpolationOrder -> 0, AspectRatio -> Dimensions[oPic[[1]]]] . Which is also similar to the output from @Kuba comment. You can play with the various options of Plots and customise the plot quite a lot :) Hope this may help you $\endgroup$ – Fraccalo Jul 2 '18 at 9:00
  • $\begingroup$ @Fraccalo Your last comment seems to go a very long way towards answering the question. Would you convert it into an answer? $\endgroup$ – MarcoB Jul 2 '18 at 14:05
2
$\begingroup$

Turning a comment into an answer:

ListDensityPlot[oPic
,PlotRange -> All
,ColorFunction -> GrayLevel
,InterpolationOrder -> 0
,AspectRatio -> Dimensions[oPic[[1]]]
] 

This lets you the possibility of playing with the Plot options for customising the output.

$\endgroup$
  • 1
    $\begingroup$ Thank you! (+1) $\endgroup$ – MarcoB Jul 2 '18 at 15:30

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