plz tell me how to choose the colormap for converting a grayscale image to rgb
1 Ansicht (letzte 30 Tage)
Ältere Kommentare anzeigen
plz tell me how to choose the colormap for converting a grayscale image to rgb.
1 Kommentar
Walter Roberson
am 6 Nov. 2013
Please read the guide to tags and retag this question. Please do not use asterisks for the tags.
Antworten (2)
Walter Roberson
am 6 Nov. 2013
Arbitrarily.
IM = rand(64,64); %a grayscale image
image(IM);
colormap(gray(256)); %display it in gray
pause(5)
colormap(copper(256)); %copper colormap
pause(5)
colormap(hot(256)); %hot colormap
3 Kommentare
Walter Roberson
am 6 Nov. 2013
Correct. That was example code. And arbitrary colormaps can be created.
Walter Roberson
am 6 Nov. 2013
If you started out with a color image, converted it to grayscale, manipulated that grayscale image, and then want to convert the manipulated image back to the original coloring, then if the manipulation creates any grayscale value that was not already present, then you cannot do the conversion back.
If you converted an image to grayscale, used that grayscale to find a region of interest (ROI), and now want to find the original colors for the pixels within the ROI, then you do not convert the grayscale image back to color: instead you use the ROI to extract pixel values from the RGB image.
Image Analyst
am 6 Nov. 2013
You can get a list of predefined colormaps by looking at the colormap function in the help.
someColorMap = winter(256); % Or whatever one you want.
rgbImage = ind2rgb(grayImage, someColorMap);
But you don't need one if you want to create a gray RGB image. Just do:
rgbImage = cat(3, grayImage, grayImage, grayImage);
0 Kommentare
Siehe auch
Kategorien
Mehr zu Modify Image Colors finden Sie in Help Center und File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!