CODEWITHSUNDEEP
c#unity-game-engine
David
David

Reputation: 361

unity: read image pixels

Im trying to read how many pixels my image has. It's working fine however it's returning a wrong pixel number. The image has 400 pixels in total and im only getting 256. 

private void Pixelreader()
{
    // Load image
    Texture2D image = (Texture2D)Resources.Load(texture);
    Debug.Log(image);

    // Iterate through it's pixels
    for (int i = 0; i < image.width; i++)
    {
        for (int j = 0; j < image.height; j++)
        { 
            Color pixel = image.GetPixel(i, j);

            // if it's a white color then just debug...
            if (pixel == Color.white)
            {
                Debug.Log("Im white");
            }
            else 
            {
                Debug.Log("Im black");
            }
        }
    }
}

it is printing 148 for white and 108 for black.. 148 + 108 = 256. So there are alot of pixels missing. Any idea why its not reading the full image which is 400 pixels?

Upvotes: 2

Views: 12570

Answers (2)

Dan Bystr&#246;m
Dan Bystr&#246;m

Reputation: 9244

Try this instead:

var whitePixels = 0;
var blackPixels = 0;
for (int i = 0; i < image.width; i++)
    for (int j = 0; j < image.height; j++)
    { 
        Color pixel = image.GetPixel(i, j);

        // if it's a white color then just debug...
        if (pixel == Color.white)
          whitePixels++;
        else 
          blackPixels++;
    }
Debug.Log(string.Format("White pixels {0}, black pixels {1}", whitePixels, blackPixels));

Pretty sure your output lines are just being truncated.

BTW, "GetPixel" is notoriously slow, but that's another story.

Upvotes: 2

Mennolp
Mennolp

Reputation: 424

I think the issue is that the rest of the pixels are not black or white, just a small tint that the eye can not see. Try debugging image.width * image.height to get the pixel count of the image.

EDIT: You should probably take a look at the max size inside the inspector of the image. It may be locked on 256.

Max size inside inspector of image.

~ Menno

Upvotes: 2

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