Description
How it works
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This tool shows how
Excel can be used for implementing image processing algorithms.
Download
.xls file
(173 KB) or .zip file(53 KB)
How to use
The image that we
want to process is made of 256 rows and 256 columns of coloured cells
starting from cell A1. The cells are sized 1 pixel by 1 pixel. One
source of such images
could be the Mandelbrot
fractal generator tool.
Click the various buttons below the input image to process it. The
image is processed and the output shown in the
cells starting from A270.
Macros must be enabled for this tool to work.
Functions provided
The following functions have
been implemented in this tool:
1. Rotation : Turning the image to the left or right;
2. Flip: Flipping the image horizontally or vertically;
3. Black and White: Converting the image to 2 colours - black
and white;
4. Colour Inversion: Inverting the colours in the image - this is like
creating a negative of the image;
5. Gray Scale: Creating the images in shades of gray; and
6. Colour Filter: Removing specified colours from the image.
There are more image processing algorithms that can be implemented,
this tool is a "proof of concept" that spreadsheets can be used for
(conviniently) testing image processing algorithms.
The screen shot shows an image (top left), its
negative (top right), the same image in gray scale (bottom left) and
with its green colour filtered (bottom right).
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