how to create Bitmap from Array?

Question

how to create Bitmap from Array?

mc 7,106

I have array of int or Color how to create bitmap?

if the bitmap width = 48 and height=12 then the array is Color

line 1 48 colors

line 2 48 colors

.....

how to create it to Bitmap?

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Answer accepted by question author

Nancy Vo (WICLOUD CORPORATION) 4,605 Microsoft External Staff Moderator

Hello @mc ,

Thanks for your question.

Since your array is laid out row by row, you just iterate through the array and map each index to an (x, y) pixel position.

You can refer to following example:

From Color[]:

Color[] colors = new Color[48 * 12];

var bmp = new Bitmap(48, 12);
for (int i = 0; i < colors.Length; i++)
    bmp.SetPixel(i % 48, i / 48, colors[i]);

pictureBox1.Image = bmp;

From int[] (ARGB packed):

int[] colors = new int[48 * 12];

var bmp = new Bitmap(48, 12);
for (int i = 0; i < colors.Length; i++)
    bmp.SetPixel(i % 48, i / 48, Color.FromArgb(colors[i]));

pictureBox1.Image = bmp;

I hope this addresses your question. If this response was helpful, please consider following the guidance to provide feedback.

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Answer 1

In Windows Forms (.NET), create a Bitmap and set its pixels from the array.

For an int[] of ARGB values (length = width * height):

int width = 48;
int height = 12;
int[] colors = new int[width * height];
// fill colors[y * width + x] with ARGB values

var bmp = new Bitmap(width, height, System.Drawing.Imaging.PixelFormat.Format32bppArgb);

for (int y = 0; y < height; y++)
{
    for (int x = 0; x < width; x++)
    {
        int argb = colors[y * width + x];
        bmp.SetPixel(x, y, Color.FromArgb(argb));
    }
}

For a Color[] (length = width * height):

int width = 48;
int height = 12;
Color[] colors = new Color[width * height];
// fill colors[y * width + x]

var bmp = new Bitmap(width, height);

for (int y = 0; y < height; y++)
{
    for (int x = 0; x < width; x++)
    {
        bmp.SetPixel(x, y, colors[y * width + x]);
    }
}

If performance is critical, use LockBits and copy the raw bytes instead of SetPixel, but the above is the simplest approach for a 48×12 image.

References:

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