how to adjust image size

Question

ash fairy 2017-6-18

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https://ww2.mathworks.cn/matlabcentral/answers/345227-how-to-adjust-image-size

回答： Image Analyst 2017-6-18

i have a point source image... i need to adjust its size...i want to maintain the size of point source as it is..but i need the background to be of size 512*512... i dont want to resize it...Just maintain point source as it is and increase the background width and height by 512*512

thanks in advance

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Answer 1

Image Analyst 2017-6-18

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https://ww2.mathworks.cn/matlabcentral/answers/345227-how-to-adjust-image-size#answer_271058

Use padarray() to add a margin of pixels around the outer edge of the image while leaving the pixel dimensions of the original image the same. For example you could have a 123x128 image and use padarray() to pad the outside out to 512x512 but the original 128x128 will be the same, not all magnified.