How to create and save the contourf image to pixel by pixel and the grey-level from 0-192

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Tina Hsiao 2021-3-24

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https://ww2.mathworks.cn/matlabcentral/answers/782718-how-to-create-and-save-the-contourf-image-to-pixel-by-pixel-and-the-grey-level-from-0-192

评论： Tina Hsiao 2021-3-25

Hello, I am a beginner at Matlab. I would like to create contourf plot. The plot size is pixel by pixel, and the grey level from 0-192. The code as below,

r_M = [4.76083603812144 4.59732757325507 3.84078375990161 2.83522761891933 2.03979313208838 1.61429885435575 1.58483400872700 2.07651813385661 2.55722735199852 2.72392206632444 2.93752535716962 3.36165244504211 4.22402540734126

5.09135259357986 5.14098053905767 3.84735386504628 2.90588398495713 2.16965294670956 1.75800774970059 1.60816653904618 2.09786569025139 2.35707830751551 2.72724672816220 2.92950291189290 3.14937669175105 3.55234768789906

5.32921037462212 5.19557229019368 3.64288236574948 2.59423164048293 2.05593607322099 1.62600765104696 1.39272324365209 1.94639828163833 2.39067573713014 2.76682320807590 3.08555090153314 3.34114325174325 3.48149717381015

5.32220300581207 4.77648710556025 3.33861857929257 2.30001087201542 1.72605713634148 1.30014731381246 1.27834395153522 1.44070837985961 2.28502229697568 3.05248804492776 3.46260438310124 3.48706102771820 3.51030149578596

4.77942253753882 4.46906792789553 3.34795711428994 2.16465765653945 1.46191531056537 0.977488872989844 0.753852737116531 1.27219788209603 2.08210681473467 3.03256963334665 3.64937747540501 3.65792537276952 3.74565551110235

4.35299275691490 4.09126935363725 3.17753495331855 2.00277281204170 1.24584659356560 0.971882708826663 0.359926751275065 0.750288700163987 1.65295259354634 2.78437256856132 3.88785048392134 4.12080325961920 3.91064049184246

3.93553132820880 3.59037099875034 3.00742566363658 2.22310301463755 1.40329829105446 0.641720673990197 0 0.353817971764671 1.25050401867387 2.52705374697445 3.90206241164242 4.23322992408431 4.07966270942597

3.81297584814867 3.50496940639607 3.07287706439689 2.35995332346616 1.86413217218313 0.936682281145216 0.260044105867860 0.421385784308465 1.16132826321159 2.46123588438794 4.02775557593691 4.61512984501341 4.56460461007416

3.68529588244402 3.45724972352478 3.08758001482871 2.71853149527819 2.01589401870171 1.20354143807865 0.587935492605682 0.670452733954317 1.32097352990551 2.73396811354949 3.39007402374409 5.12073156989824 5.19172525646325

3.57346310861397 3.30138171990411 2.94197749316414 2.76413214744990 2.20208725235252 1.60173122994903 1.11863252129357 1.05812096331277 1.41869726718747 2.25935488759645 3.69156460669313 5.55839137321558 5.66354993152361

3.65235145805927 3.17599433524990 2.86927834788569 2.62713472885208 2.18853259171050 1.85215737698314 1.37566911617467 1.43058696816551 1.71420712042859 2.17640898749974 3.77395656277310 5.85285012374981 6.21778688895472

3.88096688920101 3.25616920202222 2.94078301742807 2.49926413516375 2.08893540306161 1.76158511353697 1.58802372581860 1.49797801272054 1.65308574844975 2.50599597127705 3.97368783274096 6.05695466074494 6.57069113812358

4.49676159104381 3.28110982226297 2.97248320745266 2.51555310405689 2.18534801655490 1.67462553900224 1.32835750776993 1.30126235023730 1.60772857482591 2.41658242378975 3.88480146299220 5.64471842496219 6.78487213551137];

Max = max (r_M (:));

Min = min(r_M(:));

I = mat2gray(r_M,[Min Max]);

figure(104)

contourf(X,Y,b,256,'LineColor','none')

colormap(flipud(gray(256)));

set(gca,'xtick',[])

set(gca,'ytick',[])

Thanks a lot.

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Tina Hsiao 2021-3-25

X=[

-150 -125 -100 -75 -50 -25 0 25 50 75 100 125 150

-150 -125 -100 -75 -50 -25 0 25 50 75 100 125 150]

Y =[

-150 -150 -150 -150 -150 -150 -150 -150 -150 -150 -150 -150 -150

-125 -125 -125 -125 -125 -125 -125 -125 -125 -125 -125 -125 -125

-100 -100 -100 -100 -100 -100 -100 -100 -100 -100 -100 -100 -100

-75 -75 -75 -75 -75 -75 -75 -75 -75 -75 -75 -75 -75

-50 -50 -50 -50 -50 -50 -50 -50 -50 -50 -50 -50 -50

-25 -25 -25 -25 -25 -25 -25 -25 -25 -25 -25 -25 -25

0 0 0 0 0 0 0 0 0 0 0 0 0

25 25 25 25 25 25 25 25 25 25 25 25 25

50 50 50 50 50 50 50 50 50 50 50 50 50

75 75 75 75 75 75 75 75 75 75 75 75 75

100 100 100 100 100 100 100 100 100 100 100 100 100

125 125 125 125 125 125 125 125 125 125 125 125 125

150 150 150 150 150 150 150 150 150 150 150 150 150]

Tina Hsiao 2021-3-25

Thanks a lot

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How to create and save the contourf image to pixel by pixel and the grey-level from 0-192

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How to create and save the contourf image to pixel by pixel and the grey-level from 0-192

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