You can change the correct pixel dimensions in Paint, the one that comes with Windows. Unless you specify the dimensions in your program after saving to .jpg it will be larger depending on what DPI you picked. Even if you made correct size in the program the DPI (resolution: 72, 150, 300, 600, etc.) setting can screw up the size. So open it in Paint and click 'Resize', pick the correct pixel length, width and save to new file.
This is for people who don't know the options in other programs, so it's easy way to fix pixel dimension. Usually you pick higher DPI for stuff you want to print or down scale for crispier image. Pretty much the errors are either the wrong size (x, y) or wrong format. To see image dimensions, right click on image file and click properties, then go to details tab and check Width, Length under Image. For example raw output image for my template is ~3000 x 2000 pixels (300 DPI), ~15 MB and resized is 720 x 540 pixels (300 DPI), ~2 MB. Compared to original template, which is only 72 DPI. But I'm guessing there's automatic down scaling in DPI when you upload as you can notice the quality change.
Hope that helps someone.
This is for people who don't know the options in other programs, so it's easy way to fix pixel dimension. Usually you pick higher DPI for stuff you want to print or down scale for crispier image. Pretty much the errors are either the wrong size (x, y) or wrong format. To see image dimensions, right click on image file and click properties, then go to details tab and check Width, Length under Image. For example raw output image for my template is ~3000 x 2000 pixels (300 DPI), ~15 MB and resized is 720 x 540 pixels (300 DPI), ~2 MB. Compared to original template, which is only 72 DPI. But I'm guessing there's automatic down scaling in DPI when you upload as you can notice the quality change.
Hope that helps someone.