How to decrease image size(height, width) without losing its resolution and quality

Question

I want to decrease height and width of a image without losing its resolution, so afterwards if i want to make image height and width as original, it looks same.

I dont know how this can be achieved. Will just changing image's height and width and later increasing will result in loss of resolution to image?

Answer 1

转到图像>图像尺寸>重采样图像，然后从下拉菜单中选择Bicubic Sharper，即可获得输出