How to created a Pldecal.WAD for dummies:
 
1: First select a bitmap;
2: Press the 'load bitmap' button;
3: Resize the image (if nescessary) to a valid image size;
4: Select a filter;
5: Press the 'resize' button
6: Press the 'Locate Halflife' button;
7: Press the 'make 'WAD' button, the created pldecal.WAD will be saved in
    the MOD dir you selected, if you selected the 'Save it to c:\' it will be stored
    in c:\My halflife HLC color logo
For more information, read the F.G.A.