deleting every other line in an image

Josh Mellicker josh at
Mon Nov 12 18:50:50 CST 2007

On Nov 12, 2007, at 4:32 PM, François Chaplais wrote:

> Le 13 nov. 07, à 01:05, Jim Ault a écrit :
>> Why not use the Thumbnail Stack that Eric Chatonet has on his  
>> tutorial page?
>> Just use 1/2 * the Height and get a smoother jpg since you will be  
>> sampling
>> to get the smaller image.
> yes, but the downsizing is probably not performed by the  
> subsampling that Josh wanted (btw, Josh, do you have wavelet or sub- 
> band filtering in mind?)

Hi François,

Wow! I don't need those, but it is very impressive if you have  
implemented those algorithms!

What I am hoping to do is simply throw away every other line and  
construct a new image only consisting of every other line.

I wonder if there is a way to use some kind of crude  "nearest  
neighbor" resizing method where I can resize to 50%, that will not  
blend the lines but just throw away every other one.

>> No need for all the looping and slow pixel-by-pixel work.
> as I said, it's a different algorithm.
>> Jim Ault
>> Las Vegas
> Francois Chaplais
> 35 rue Saint-Honore
> 77305 Fontainebleau Cedex
> France
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