# Replacing pixels with custom images in Mathematica?

How can I replace pixels of a binarized image with a custom image in Mathematica? I realized that once I have a matrix M of 0 or 1 entries depending on the white or black pixel (which I can get using Binarize and manipulating the output a bit), I can use Graphics [] to place a custom image with a square border in a grid where there is a 1 and a flat background when there is a 0, but I don't know exactly how to do this. Thank you in advance:)

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If `M`

is your matrix containing 0 and 1 and `image0/image1`

is the images you want to display:

```
image0 = Graphics[{Red, Disk[]}, ImageSize -> 10];
image1 = Graphics[{Blue, Rectangle[]}, ImageSize -> 10];
M = {{0, 1, 0}, {1, 1, 1}, {1, 0, 0}};
```

You can simply do this:

```
GraphicsGrid[M /. {0 -> image0, 1 -> image1}]
```

or, if you want 0 to be empty:

```
GraphicsGrid[M /. {0 -> "", 1 -> image1}]
```

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Here's one way:

```
mat = RandomInteger[1, {10, 10}];
Graphics[MapIndexed[If[#1 == 1, Disk, Circle][#2, 0.4] &, mat, {2}]]
```

I like to use different versions for this `MapIndexed`

. Instead of `Disk`

or, `Circle`

you can use any other graphic object. Just create a function that will take position as an argument and create this object.

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