Upscaling is the process of increasing the size of an image while preserving its detail and clarity.
A lot of people think you can take a small image size, for example 1500 pixels x 2100 pixels (which is a 5"x7" size) adjust the size on their computer to something larger such as 4800 pixels x 6000 pixels (which is a 16"x20" size), set the resolution at 300DPI and it’ll print sharp and detailed.
That’s not how it works.
Think of an image like a mosaic made of tiny squares.
Those tiny squares are all the detail the image has.
So if a picture only has 100 squares, when you enlarge it without changing anything else, those same squares just get stretched out.
So instead of looking crisp, the image starts to look: soft, pixelated, slightly blocky.
Upscaling the art adds MORE squares but it’s not just copying and pasting the old ones, it generates new squares to fill in what should be there between them.
Think of it like this:
When you enlarge an image:
- you just makes the tiles bigger without adding any new ones
When you upscale an image:
- breaks those big tiles into smaller tiles and add NEW tiles to rebuild the missing detail between them
Most vintage artworks weren’t created at large sizes. Many original pieces are painted around 8"x10", 11"x14", or similar. That works fine for small prints but if you want to print that same image at 16"x20", 18"x24", or larger, the original file usually doesn’t have enough resolution so the final result will look soft, blurry, and pixelated.
The goal isn’t to change the artwork, it’s to make sure it scales properly. When done right, the image keeps its detail, avoids that soft or pixelated look, and still feels true to the original.
All of my prints are upscaled using multiple programs to make sure they stay sharp and detailed at any size. Each program handles things a little differently, so using more than one helps avoid softness, distortion, or that overly smooth look you sometimes see in enlarged images. The goal is to keep the detail intact and make sure the image actually holds up when it’s printed larger. Taking the time to do it properly is what keeps everything looking clean and consistent from small sizes to large ones.