processing all jpg images from path <src> , crop <x> pixels from bottom, save to <dest>.

cropBottomByX.m

function cropBottomByX(src, dest, x)
  srcImgs = [dir([src filesep '*.jpg'])];
  
  for i = 1:length(srcImgs)
    imgLocation = [src filesep srcImgs(i).name];
    img = imread(imgLocation);
    [h, w, d] = size(img);
    disp(sprintf('Resizing image %s from %d to %d ...\n', srcImgs(i).name, h, h-x));
    img2 = img(1:h-x, :, :);
    imwrite(img2, [dest filesep srcImgs(i).name]);
        
  end
end

scaleToSizeXY.m

function scaleToSizeXY(src, dest, width, height)

  srcImgs = [dir([src filesep '*.jpg'])];
  
  for i = 1:length(srcImgs)
    imgLocation = [src filesep srcImgs(i).name];
    img = imread(imgLocation);
    [h, w, d] = size(img);
    
    
    if h / w > height / width
      h2 = floor(height / width * w);
      img2 = img(floor((h - h2)/2):floor((h - h2)/2+h2), :, :);
    elseif h / w <= height / width
      w2 = floor(h * width / height);
      img2 = img(:, floor((w-w2)/2):floor((w-w2)/2+w2),:);
    end
    
    disp(sprintf('Scale image %s...\n', srcImgs(i).name));

    img3 = imresize(img2, height / h);
    
    imwrite(img3, [dest filesep srcImgs(i).name]);
end