Re: Normalization inverts image???

I suppose you better use the following formula:

pixOut = 255 * (pixIn - min) / (max - min)

This should work and give you a positive image.

Egon Dorrer



Vexed Puppy schrieb:

> I'm trying to perform normalization /contrast stretching on a gray
> scale image.
> However when applied I get a negative of the image. As i understand to
> normalize an image i process each pixell using this formula:
>
> pixOut = ((pixIn - max)*((255-0)/(min-max))+0);
>
> where max is the maximum pixell density (say 235) and min is the
> minimum (say 25) and the 255 and 0 are representing the complete range
> of values.
>
> I'm going wrong somewhere but not sure where that is :/