Save image as grayscale with specified resolution

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Soda
Soda 2019-11-15
编辑： Image Analyst 2019-11-15
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!

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Image Analyst
Image Analyst 2019-11-15
编辑：Image Analyst 2019-11-15
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');

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