You could work in 1920x1080 and then resize it to 640x360. The aspect ratio is the same.Oh, haha, I thought you were meaning to make it 160 x 90.
Anyways, I want the image itself to be high quality--not just on the computer screen. 640 x 360 is too small of a canvas to work with for me.
Yep, file size can become an issue, but I have squished a 2560x1440 .png into 1.8mb, looked great.Well let me help you out here is the best answer and if my other fellow yttalkers said the thumbnail size should be 1280w and 720h also thumbnails cannot be bigger than 2mb