This is where I can be a little vague!
It depends on some factors, but the most significant one is how accurate the model is!
A model is typically a perfect representation of what the computer model looks like. The more accurate it is, the higher the resolution will need to be!
There are many factors that go into how accurately a model is created, but the biggest ones is the model itself.
A model is what we will be drawing on in our drawing area, and we will want to be able to have a sharp image on the computer screen.
On paper you can actually see this in pencil at about 300 dpi (density), but this is not true for every material. The best medium is metal in that sense. This is why your computer screen is at least 500 dpi (density), as that is the maximum resolution that is usable. The screen will need to be at least that sharp to print on.
The most common way Photoshop developers do this in Photoshop is to use the Brush Tool to blur an image. This is called an ‘Blurring Mask’ or ‘Color Blurring’. The trick is in using this tool you can blur an image by varying the brightness of a pixel (color) by how much (in other words by how much ‘light’ it is).
Blurring masks are generally not suitable for high-end screens which are too small to fit the desired image. A common way to solve this is to just increase the brightness of your layer as though you were using an Lasso.
In the first image above we would have used the Lasso to add white. If we had changed the brightness to 5, this would have added more white to the layer. This way the image is made from more ‘light’ information.
In the second picture above we would ‘blur’ from bright to dark by using the Brush Tool to blur from 5 to 0 (in other words, you wouldn’t create a single white pixel on your layer). Since 5 corresponds to about -0.03 (lightest gray) we would get something more like 0.0075 which means we would want to create an even lighter white pixel on the next layer.
A final solution that might be suitable for a lot of use cases is to use the Lasso and ‘Lasso Distort’ to change the brightness/color depending on the position of the object. This is quite useful for making a ‘light box’ around
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