2017년 4월 6일 목요일

Code colors in App inventor. RGB-opacity. Get color. Pick color.


These days I'm studying the colors in App Inventor.

I have posted tutorials about colors, but...  ummm are in Spanish, but maybe can help someone.

In Spanish RGB is (Rojo, Verde, Azul) RVA.

1. This about subtraction color (CMYK):


2. In this app you pick color over image Canva and get RVA

If color is R= 240, V = 130, A = 80 then get Color = -1015216

Sub ConvertLongToRGB(ByVal Value As Long, R As Byte, G As Byte, B As Byte) 
R = Value Mod 256 
G = Int(Value / 256) Mod 256 
B = Int(Value / 256 / 256) Mod 256 
End Sub

Color = RVA - 16777216


3. In this tutorial you set R = 240, V = 130,  A = 80,  opacity = 255 and get Color =  4293952080

 N = A + (V + (R + (256 x opacidad)) x 256 ) x 256


4. This about opacity:


5. This is an app by Italo about RGBtoCMYK


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Very complete study. And thanks for the mention!
You might find this app I made about fading interesting too: Canvas smooth fade to/from black (or any color)

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