difference in size of first image processed in for loop

Hi,

I am saving set of images in a folder uisng for loop operation, here, my first image always saves in different size.. For e.g. If I am saving 100 images, all images are of size 884 x 657 pixels, however, first image being 884 x 663 pixels. Is there a way to fix this, in such a way to get unifrom size across all the images. ??

[Nitin Kapgate]

Can you please share the loop code you are using?