清空筛选条件
清空筛选条件

Color conversion RGB to Lab

2 次查看（过去 30 天）
med BT
med BT 2017-3-6
评论： med BT 2017-3-6
Hello, I want to convert a RGB image to L*a*b*, I did some research and I found two different codes, and the results are also differents.
1st code :
src = 'Img1.jpg';
rgbI = imread(src);
labI=rgb2lab(rgbI);
imshow(labI(:,:,1),[0 100])
2nd code :
src = 'shad.jpg';
rgbI = imread(src);
labTransform = makecform('srgb2lab');
labI = applycform(rgbI, labTransform);
imshow(labI)
Could you please tell me which one is the correct conversion.
  2 个评论
Stephen23
Stephen23 2017-3-6
Your source images are different:
src = 'Img1.jpg';
src = 'shad.jpg';
med BT
med BT 2017-3-6
I work on the same image

请先登录，再进行评论。

请先登录，再回答此问题。

回答（1 个）

Stephen23
Stephen23 2017-3-6
编辑：Stephen23 2017-3-6
The makecform default illuminant is ICC, but sRGB uses D65. So you need to specify the correct whitepoint for that conversion
makecform('srgb2lab', 'AdaptedWhitePoint', whitepoint('D65'))

类别

在 Help Center 和 File Exchange 中查找有关 Image Processing Toolbox 的更多信息

标签

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by