How to save image as pixel by pixel size and without white background

3 vues (au cours des 30 derniers jours)
Tina Hsiao
Tina Hsiao le 7 Avr 2021
Commenté : DGM le 7 Avr 2021
Hello, I would like to seek help for the image save as bmp.file with pixel by pixel size and without white background.
clear all; close all; clc
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;-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;-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;-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;-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;-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;-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];
r_M = [27,19,12,8,3,3,1,0,0,3,9,15,23;30,20,14,9,5,3,1,0,0,3,7,12,21;33,23,15,11,6,3,2,1,2,4,7,13,20;33,23,15,12,7,4,2,2,2,4,7,12,19;30,20,16,13,8,5,3,3,4,5,7,12,20;27,20,16,14,9,6,4,4,5,5,7,12,21;27,20,16,14,8,5,3,3,4,4,6,11,20;27,19,15,13,7,5,3,2,3,4,6,12,21;25,18,14,12,6,4,2,2,3,4,6,11,21;28,19,15,13,7,4,2,2,3,4,7,13,23;29,19,15,13,8,5,3,2,2,4,7,15,25;33,22,17,14,8,5,3,2,2,3,5,12,23;37,25,19,15,8,6,4,2,1,2,2,10,19];
figure(3)
contourf(X,Y,r_M,2560,'LineColor','none')
shading interp
axis square
% colorbar
% caxis([0 4])
colormap(flipud(gray(256)));
set(gca,'xtick',[])
set(gca,'ytick',[])
% %-------save compensation hologram-------
name = 'hologram';
fpath = 'C:\Users\Admin\Desktop';
saveas(gca, fullfile(fpath, name), 'bmp');

Réponse acceptée

DGM
DGM le 7 Avr 2021
Modifié(e) : DGM le 7 Avr 2021
Getting figures saved in a particular way is always a challenge, and the methods vary with versions. Personally, I just use export_fig()
set(gca,'units','pixels')
origpos=get(gca,'position');
origpos(3)=399; % 400-1
set(gca,'position',origpos)
outpict=export_fig('-a2','-m1');
This gives me a 400x400 close-cropped image, and should work so long as the figure window is big enough. You can just save the image as needed.
imwrite(outpict,'finallyworks.png')
  4 commentaires
DGM
DGM le 7 Avr 2021
Modifié(e) : DGM le 7 Avr 2021
How did you unpack the zip file? I imagine one of two things happened. Either you didn't unpack all the files, or when you added them to the path, you didn't add all of them. It's usually more convenient to have them all together in a dedicated directory and then add that whole directory to the path.
You can check by:
which export_fig
which hyperlink
which isolate_axes
etc
DGM
DGM le 7 Avr 2021
Ah well good!

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