Library tutorials & articles
Image Manipulation - Color
By Mitch Dusina, published on 11 Sep 2007
Languages I know (from most comfortable with, to least comfortable with): VB.NET, C#, VB6, and C/C++
I'm 19 years old and pursuing a MS in Computer Science at the Colorado School of Mines. My...
Languages I know (from most comfortable with, to least comfortable with): VB.NET, C#, VB6, and C/C++
I'm 19 years old and pursuing a MS in Computer Science at the Colorado School of Mines. My...
Introduction
As stated in my Inversion Article, color is represented -- both in the
human eye and in the .NET world -- as a Red Green and Blue
component. Adjusting the color components in an image can fine
tune a digital picture (small adjustments) or act as a complete color
filter (large adjustments). You may also think of it as
"adjusting the shade of each color channel".
Once again, here is our unaltered Earth:
Here is the Earth with some minor color adjustments (Red increased and Blue decreased):
And finally, here is extreme adjustment (Red and Green decreased to 0):
The forumla to adjust color may be represented by:
Earth Image shot by NASA, provided by FreeImages.co.uk
Adjustments performed by my image program, Colithium Graphics
Once again, here is our unaltered Earth:
Here is the Earth with some minor color adjustments (Red increased and Blue decreased):
And finally, here is extreme adjustment (Red and Green decreased to 0):
The forumla to adjust color may be represented by:
New_Value = Old_Value + Adjustment_Amount
If New_Value < Value_Minimum
New_Value = Value_Minimum
If New_Value > Value_Maximum
New_Value = Value_Maximum
Earth Image shot by NASA, provided by FreeImages.co.uk
Adjustments performed by my image program, Colithium Graphics
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It doesn't need to be computed, it should be passed in. It's a byte so valid values are between 0 and 255. If the second parameter is set to true, then 0 = 0% and 255 = 100%
Hi Nimpo,
Your article is awesome. Only one thing I can not figure out. That is the threshold value.
Can you suggest me how can i compute the threshold value for "Image Manipulation - Color - Black and White" ? Thanks.
Regards,
Shuvo.
I have just returned from an extended absence from this forum so I realize this is rather late.
I apologize! I was almost certain I had included those routines at the end of all of my articles (I guess it slipped my mind). I will edit all affected articles to include the code.
Great stuff!
Only one issue: I've never found this class/library you use: SupportFunctions ...
Even after spending (wasting) hours over the internet.
Can someone help me (us) ?
Thank's, Fred
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