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Sample 22

Replacing colors and creating transparency

The sample shows how to load JPEG image from file, convert it to Palette image and change colors of all pixels where red value is less than 72 to black transparent color


Dim im
Set im = CreateObject("ActiveImage.Images.1")
'im.CreateImagePalette 300,400
im.SetImageType 1
im.ReadFromFile "C:\AI\rose.jpg"


width = im.GetWidth
height = im.GetHeight

colorbk_r = 0
colorbk_g = 0
colorbk_b = 0

Threshold = 72

For x = 0 to width
for y = 0 to height

r = im.GetPixelRed(x,y)
g = im.GetPixelGreen(x,y)
b = im.GetPixelBlue(x,y)
if r < Threshold then
im.SetColor colorbk_r, colorbk_g, colorbk_b
im.SetPixel x,y
end if

im.SetColor colorbk_r, colorbk_g, colorbk_b
im.SetTransparent 1
im.SetSaveAlpha 0

im.SetImageType 3
im.WriteToFile "C:\AI\Threshold.gif"
im.SetImageType 0
im.WriteToFile "C:\AI\Threshold.png"

Set im = Nothing

 Picture 1. rose.jpg (size - 6,3Kb) Picture 1. Threshold.gif (size - 11,4Kb)

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