I've been working on a remod (basically Highres pack + map changes here and there through BSPEdit) for an old mod called "Night at the Office".
At the end of the mod, a newscast reports on the aftermath of the terrorist attack, and in that sequence, a sprite known as wide_scrn.spr & wide_scrn2.spr is used for scanlines effect. Due to how short the original sprite was, it resulted in the outer areas of the scene being clearly seen, ruining the effect. When I did try to extend the size and cover up the wider areas of the screen, the result I got was nothing but blue. Now, as shown on the pictures above, I already know how to make a sprite transparent using the last color transparency thing, but I can't for the life of me figure out why is this one sprite refusing to work, which is why I'm searching for help here.
Here's both the original sprite and my edited one, perhaps it could be really my mistake:
http://www.mediafire.com/file/3be8f6lm0a64j9a/wide_scrn.7z
I'm using Photoshop.
It's going well enough, until I hit this roadblock.