How to save images!?

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Rayan Matlob
Rayan Matlob on 5 Jul 2022
Commented: DGM on 6 Jul 2022
Hello, for the next code, when i run the code i get a subplot as bellow,
But when i save them, they turn into black and white.
fig, RGB = plt.subplots(1, 3, figsize=(10,10))
for j in range(3):
RGB[j].set_title(rgb_list[j], fontsize = 15)
cv2.imwrite('R_9_1_GSM_5/Good/Red/'+image_name, (Good_RGB[:,:,0]*2))

Answers (1)

DGM on 5 Jul 2022
Edited: DGM on 6 Jul 2022
I have no idea what this code is, but the images are grayscale. When you isolate one color channel, that's all it is. It's a single-channel intensity image. There is no color information.
The images shown are represented as pseudocolor images -- they have a colormap applied to them. In this case, it's probably something similar to parula() or winter(). Use ind2rgb() to apply the selected colormap to the image and create an actual color image.
inpict = imread('peppers.png');
[R G B] = imsplit(inpict);
montage({R G B}) % they're all grayscale
cmap = parula(256);
R = ind2rgb(R,cmap);
G = ind2rgb(G,cmap);
B = ind2rgb(B,cmap);
montage({R G B}) % they're all colormapped using parula()
DGM on 6 Jul 2022
Like I said, I don't know what language that's written in. All I can do is say how it's done in MATLAB.

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