B4J Question bitmap.getpixel is so slow?

[liulifeng77]

hi,
When I was working on pictures, I used "bimap.getpixel", but it is very slow. Is there any way to make it faster? Thanks.

 

[Erel]

GetPixel itself cannot be made faster. It might be faster to get all pixels at once though it is more complicated.

What exactly are you doing?

 

[liulifeng77]

I want find a retangle filled pure color(green or red) from a picture.if check the pixel one by one, it is too slow.any suggestions?thanks.

 

[Erel]

Getting all pixels at once: https://www.b4x.com/android/forum/threads/get-image-pixels.91666/

 

[liulifeng77]

wow，it is so fast. thanks.

 

[Erel]

Check BitmapCreator if you want to do the other side of the conversion, convert an array of bytes to an image.