When using imread, changed the background colour of image?
13 visualizaciones (últimos 30 días)
Mostrar comentarios más antiguos
I had an image of a red cross with a background colour of white, after I used imread, it returned an image with a black background. Why is this? And, does it have anything to with the file format? (.png) This is messing with the entire program.
0 comentarios
Respuestas (1)
Image Analyst
el 14 de Jul. de 2013
Extract the color channels and see what the values are
% Extract the individual red, green, and blue color channels.
redChannel = rgbImage(:, :, 1);
greenChannel = rgbImage(:, :, 2);
blueChannel = rgbImage(:, :, 3);
Then pick a row and column that's in the background and see what they are
r = redChannel(row, column)
g = greenChannel (row, column)
b = blueChannel (row, column)
Tell us what your values are.
3 comentarios
Image Analyst
el 15 de Jul. de 2013
If it's a uint8 image, the values should be integers going from 0 to 255. If you have a double image (floating point) then all values must be in the range 0-1 if you want to display them with imshow(). [0,0,0] is pure black. [0,0,1] is pure blue. [1,1,1] is pure white. Any transparent pixels in your PNG image will show up in the "BG" color. Maybe your background is not really transparent like you thought.
Ver también
Categorías
Más información sobre Red en Help Center y File Exchange.
Productos
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!