changing the rgb values of the pixels in a jpg image
2 visualizaciones (últimos 30 días)
Mostrar comentarios más antiguos
J=imread('A.jpg');
for i=1:r
for j=1:c
J(i,j,1)=newrgb(1,1);
J(i,j,2)=newrgb(1,2);
J(i,j,3)=newrgb(1,3);
end
end
%%newrgb is a matrix with 3 rgb values.
when I check the newrgb matrix, it has double values larger than one,i guess 1 to 255.
I know imread gives me values of uint8, but i tried converting the newrgb values to uint8, or even converting the rgb of my image to double, but the result is a white picture, what should i do?
thank you
1 comentario
Poornakant
el 15 de Jul. de 2017
Hello Roshana, I'm working on something similar to this question of yours. Changing the RGB values of a pixel to get a specific curve of an image. I'm new to MATLAB coding could you please help me with the method you've used to sort your problem. Thank you.
Respuestas (3)
Walter Roberson
el 6 de Abr. de 2011
Replace your 3 existing assignments with
J(i,j,:) = newrgb .* 255;
2 comentarios
Walter Roberson
el 6 de Abr. de 2011
What value range is newrgb ? And what data class is the variable?
roshana
el 7 de Abr. de 2011
1 comentario
Walter Roberson
el 7 de Abr. de 2011
If J is uint8 and your newrgb values are in the range you indicate, then your original code will set the entire block J(1:r,1:c,:) to be the color indicated by newrgb. If r and c are the size of J then the result would be a monochrome picture. If the values in newrgb are all the same, then the monochrome picture would be a shade of gray.
After you assign the values, look at J(1,1,:) to see whether the values match the (rounded) values of newrgb .
Ver también
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!