So trying to learn a bit about concurrent programming prior to my class next semester and thought a good way to learn would be to write a simple application. Kinda odd how simple apps seem to grow so quickly into something that is beyond my scope of knowledge.
I wanted to originally write a simple image manipulation tool, as I thought it would be neat to look into really basic manipulatoin and try and perform them on separate threads. I had initially thought of doing it somewhat similar to what I head learned in CS370 of breaking the image into smaller images and offloading the processing onto small threads. There seemed a pretty good class offered in the .NET framework for this sort of thing; the threadpool class.
However nothing turned out as I had expected and trying to use the threadPool class was nightmarish. I think partially the reason may be is that I am not setting up the image object properly so that multiple threads can access it. I guess the two approaches were either:
- Manipulate the actual image file and refresh the component with the new image every time a thread is done executing
- Manipulate the pixels that are actually being displayed.
Either or it didn’t seem to work.
Decided to scale back my attempts and just decided to go for a 1 thread (backgroundworker) approach. I had succesffuly done grey scaling (which was neat to learn on how something so simple can actually be pretty intense if you want to make the greyscale perfect). I had chosen to use the values :
private const RED_FACTOR = 0.299; private const GREEN_FACTOR = 0.587 private const BLUE_FACTOR = 0.114
Color currPixelColor =originalImage.GetPixel(i, j); double red = RED_FACTOR* currPixelColor.R; double blue = BLUE_FACTOR * currPixelColor.B; double green=GREEN_FACTOR*currPixelColor.G; double grey = red + blue + green; changedImage.setPixel(i , j , grey , grey , grey);
I then tried to put RGB sliders, however I seemed to have hit a wall in making the sliders feel really responsive. I guess I would appreciate help from anyone if they have any ideas on how to do it.
[caption id="attachment_71" align="alignleft" width="395" caption="Here is the application with an image greyscaled."][/caption]