MATLAB: Bitmap contrast issue

binarybitmapbmpcontrastconvertgrayscaleimageimreadprocessing

When I use the imread function to open a grayscale .bmp image, the contrast displayed is far darker than the original image, which causes problems for image processing. Converting the image to .jpeg eliminates the contrast issue, but I have several thousand images to read and I don't want to have to convert them all. Is there a way to get MATLAB to read .bmp files correctly?

Best Answer

Are you sure it's not reading them correctly but you're just viewing a small range?

try:

imshow(imread('example.bmp'),[]); %whole range

Edition:

What class is the bitmap file?

I = imread('example.bmp');
class(I)

and then what class is the corresponding JPG file?

I = imread('sameexample.jpg');
class(I)

Related Solutions

MATLAB: Overlay binary image on RGB image

Is this?

RGB_image=imread('image_test.jpg');
subplot(311);imshow(RGB_image);
bw_image=im2bw(rgb2gray(RGB_image));
subplot(312);imshow(bw_image);
result=imfuse(RGB_image,bw_image);
subplot(313);imshow(result);

Detail documentation here

MATLAB: Conver bmp image to color image

Is im an indexed image? What does this say

[im, colorMap] = imread('5 2R.bmp');
whos colorMap
[rows, columns, numberOfColorChannels] = size(im)

Best Answer

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MATLAB: Overlay binary image on RGB image

MATLAB: Conver bmp image to color image

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