Ahhhhhhhhhh..... A picture speaks a hundred words! :scruff:
Ok, you're starting with a .jpg
JPG is notorious for 'mucking' with the image when you save it.
The image you uploaded has a white (mostly) background, not green??
If you use the "Color Picker" tool (eyedropper), and pick one of the white pixels far away from the image, you'll see that even those are not completely white. The pixel values are (254,254,254). Total white is (255,255,255).
Now, use the "Select Region by Color" tool, and pick away from the image. Make sure the "Threshold" is set to '0'. Notice all the pixels around the image that are 'kind of' white?
For the Transparency Dialog in RMXP to set a color, they all have to be EXACTLY the same color. Otherwise, you get all that fuzzy / speckly white around your image.
So, you either need to make ALL of the background the exact same color, or just make it transparent, and don't worry about the Import setting the transparency.
Here's what I would do. (Some of our Graphic Artists here may have a better way)
Create an alpha channel
Use the "Select by Color" tool, and set the threshold to 16 (looks like a magic # for this image)
Select a pixel far away from the image
Now, you'll see that some of the white pixels inside the image (eyes, collar) get selected.
You can use one of the selection tools, and set the "Mode" to "Subtract", and remove those
areas from the selection.
Or, since I'm lazy, I just erase them, then either use the "Fill" tool, or another layer below the image to paint them back in. Either way....
CNTL-K will erase the selected pixels.
Crop & Scale to get your desired size.
Save as .png, NOT Gimp format(.xcf) (you still have the original .jpg as a backup)
Copy the image into the Graphics\Battlers folder in your project. Don't bother with the
Import function.
I hope that helps...
Be Well