Dismatching dimensions when trying to adjust the width and height [closed]

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I haven't got the right dimensions for my picture when i try to adjust the width and height, nder the image menu->image size, i try to give dimensions to my picture of 640 as width and 960 as height, however, i couldn't do that, here is what i got :

I try to export my picture as PNG, but the dimensions are automatically give开发者_如何学JAVAn when just adjust either the height or the width, so i didn't got the right one that i need.

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You need to unclick the 'Conserver les proportions' checkbox, that will let you specify height and width without Photoshop doing any automatic scaling