How do you save a tiff or bitmap as a certain pixel resolution?

I specifically neeed to save my images in 1024 by 768 but can't figure out how. trusize is too large for my screen so it automatically gets resized to 56% of its original size when i use it with getframe.Im trying to get homogenously grey images of decreasing grey to get the full gray spectrum for a gamma calibratiin and just cant save the resolution. This has been pretty wordy but any help wuld be greatly appreciated! Andy

for ii = 1:4:grayscales;

    Img = 0 + (ii - 1);

    figure('ColorMap', gray(256)); image(Img);axis equal; axis tight;
        axis off;
   truesize(gcf,[1024 768]);

    Image = getframe(gcf);

    %imwrite(Image.cdata,['gray',num2str(ii),'.tiff'], 'Resolution', [500]);
    imwrite(Image.cdata,['gray',num2str(ii),'.bmp']);

    close all

Answer 1

[Kevin Claytor]

Instead of trying to save the capture of the frame with the image, why not save the image itself with something like;

Img = 0 + (ii - 1);
imwrite(Img,['gray',num2str(ii),'.bmp']);

Also I'm kind of confused, because Img seems to be a scalar, and not an actual image? Do you want an entire image of a single level of gray? You could create that image with something more like;

Img = ones(768,1024) * graylevel;

[Andy]

yeah! Img = ones(768,1024) * grayscale; worked! Thank you; miss the simple stuff sometimes!