SOLAR H-alpha EQUALIZE
A trial procedure to render H-Alpha picture (whole Sun ) more homogeneous
... if you find some easy ameliorations please tell me about !
The process goes like this :
1. make a copy of the sharpened image ... this will be the mask
2. apply a very high value Gaussian blur (example 100)
3. transform to negative
4. fill the white space with black paint
5. multiply the original image by the mask applying a moderation dividing
factor
The process which is not software dependant is illustrated below with PSP ...
ORIGINAL sharpened
H-Alpha IMAGE : Top and bottom are darker ! |
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From left to right
: Gauss 100*** / negative / outside black painted ***
This parameter is important and the best value will be found by trials. |
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Multiply operation
using a moderation (dividing) factor of 128 ... less than 128 gives
a brighter image, more than 128 a darker one |
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The improvement
resulting of the EQUAL processing speaks for itself ! |
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Improving a mosaic by the same technique ...
