[Tutor] Python Image library

[elis aeris]

ahh~

it goes horizontally first

why didn't I think of that?

thank you ~

On 7/19/07, Tiger12506 <keridee at jayco.net> wrote:
>
> You know the height and the width of the image, no?
>
> So you know that every 'width' number of pixels will start a new row.
> So if you wanted say the fifth row down, second pixel, how would you find
> it?
>
> The 1st line:  'width' number of pixels
> The 2nd line: 'width' number of pixels
> The 3rd line: 'width number of pixels
> The 4th line: 'width' number of pixels
> The 5th line: 2 pixels in from the left
>
> Add those up ~  width+width+width+width+2
> Or  4*width+2
>
> That number is the index to use to get the pixel at coords (2,5)
> so
>
> pixel = getdata()
> pixel[4*width+2]
>
> For this example.
> Work out a more general solution for yourself please.
>
> JS
>
> > getdata() returns a flattened list, [n]
> >
> >
> > but i am not sure how to access it.
> >
> > when I want to get rgb from a window of 100,200,
> >
> > get data starts from 0    (0~99, 0~199)
> >
> > the point of  x,y = 2, 1
> >
> > do I put in
> >
> > pixel[100]   ?
> >
> >
> > it's actually not the case  @_@
> >
> > what should I put in ?
>
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