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

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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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