Save image as grayscale with specified resolution

Hello!

I want to save image (preferably jpg or tif) as grayscale with specified resolution(500 px * 500 px).

I converted image to gray scale and then blurred and added some noise. Following is what I tried

I = imread('sth.tif');
greyI = rgb2gray(I)
Iblur = imgaussfilt(greyI,1);
Inoise = imnoise(Iblur,'speckle',0.02);
inshow(Inoise)
saveas(Inoise,'image.tif')

However, when I try to save image using either imwrite, or saveas, it converts the image back to a color image and original resolution.

Thank you for your help in advance!

Answer 1

[Image Analyst]

saveas() saves a screenshot, which can be any resolution - you can drag the window to any size you want, right?

You should use imresize(Inoise, [500,500]) then imwrite() which saves the image itself with the actual pixel dimensions (rows and columns).

Inoise = imresize(Inoise, [500,500]) ;
imwrite(Inoise, 'image.tif');