imagedata:getPixel(x,y) is nil?

[jalamaya]

i am attempting to get the color of the pixel at a certain position of the image i have

Code: Select all

mainImage=love.graphics.newImage('test.png')
r,g,b,a=mainImage:getPixel( 20,20 )

then i will get the error message of:
main.lua._: attempt to call method 'getPixel' (a nil value)

pls help

[Kingdaro]

You need to use image.getImageData, not graphics.getImage. You can create a drawable Image from the ImageData.

Code: Select all

mainImageData = love.image.newImageData('test.png')
mainImage = love.graphics.newImage(mainImageData)

r,g,b,a = mainImageData:getPixel(20, 20)

[HugoBDesigner]

Actually, the correct function is [wiki]love.image.newImageData[/wiki], but other than that Kingdaro is completely right.

[Kingdaro]

Ah, right. My mistake. I make that mistake all the time.

[jalamaya]

You need to use image.getImageData, not graphics.getImage. You can create a drawable Image from the ImageData.

Code: Select all

mainImageData = love.image.newImageData('test.png')
mainImage = love.graphics.newImage(mainImageData)

r,g,b,a = mainImageData:getPixel(20, 20)

Thanks! So imageData is actually different from image. Thank you very much!