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why % bitte mehrfach ausführen
spy
 

image
axis ij tight
alpha color
 

defimage = pow2(get(0,'DefaultImageCData'),47);
lowbit=47;
highbit=51;
numbits=highbit-lowbit+1;
b=bitand(fix(bitshift(defimage,-lowbit)),bitcmp(0,numbits));
b=b/max(b(:));
imshow(b);
figure
lowbit=42;
highbit=46;
numbits=highbit-lowbit+1;
b=bitand(fix(bitshift(defimage,-lowbit)),bitcmp(0,numbits));
b=b/max(b(:));
imshow(b);