How To Make Some Art For Your Walls

The image that I am blowing up is the cover of the first issue of "Love and Rockets"

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I've just been a fan of Jaime Hernandez for decades.
 
In it's current state, the image can't easily be blown up to put on a wall. Here are the issues:

1) the image is a bitmap and it needs to be a vector to blow it up

2) the image is multicolor and it needs to be monochrome to laser cut it

3) Ideally, I will removed all of the large areas of black, so that the picture can be cut by the laser in less than 24 hours. A laser will happily cut big ol' areas of black, but it takes forever because the laser is a fraction of millimeter wide.

So I have to address issues #1, #2 and #3.

In order to make the picture more usable on the laser, I am taking the JPG that I downloaded off of the Internet, and I am blowing it up using Gigapixel AI.

Gigapixel AI is something like $100 and does a great job of blowing images up to very large sizes.

The pic will probably be about 32 inches wide, so with a DPI resolution of 300, that means I need a pic that's about 9600 pixels wide.
 
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After resizing the image in Gigapixel AI, I load the image into Gimp.

I need to remove all of the colors in the image, so that it can be laser cut.

First, I reduce the number of colors using the "posterize" filter. (Colors -> Posterize)

After reducing the palette, I have to manually eliminate all of the portions with color.

I do this by using the "Select by Color" tool (Shift + C), selecting each color one by one, and then deleting those colors.

Basically taking the image from about sixteen colors to two (black and white.)
 
Yep.

And Cupscale is free, and I support the author on his Patreon because Flowframes is fantastic. But if you're willing to buy software to resize images on Windows, I personally prefer Gigapixel to Cupscale.

But, again, there's a lot of ways to resize images using AI.

https://github.com/n00mkrad/cupscale
I've been upscaling movies using AI using a pile of Nvidia cards for about a year now. Great stuff. (It takes about 18 hours to resample each movie.)