[Other] Sprite Indexing Problem

[bass_synth]

Hi, everyone. I'm quite new to ROM hacking, and there is one problem I can't overcome no matter what I do. The thing is, I wanted to change the sprites in FireRed for starters, I've got both unLZ and NSE 2 for doing that, and got PS CC 2015, Irfanview installed. Now, to the problem:
After finishing editing the sprite, I open it on PS and Index it, the status changes to Index, I even do the color decreasing part and stuff but when I save it and try to Load it with unLZ, I have an "Image not indexed" error, and with NSE 2, I have "Image not indexed or used undefined alpha channel." I found some tutorials about creating alpha channels on Photoshop, and I tried everything, even saving it with a PNG 24 format with transparency, but it still doesn't work. The thing I don't like about Irfanview is it screws up the colors, so it's like I have to draw the sprite again, and it sucks. What should I do to get a correctly indexed PNG from Photoshop? Thanks in advance.

 

[Vendily]

Hi, everyone. I'm quite new to ROM hacking, and there is one problem I can't overcome no matter what I do. The thing is, I wanted to change the sprites in FireRed for starters, I've got both unLZ and NSE 2 for doing that, and got PS CC 2015, Irfanview installed. Now, to the problem:
After finishing editing the sprite, I open it on PS and Index it, the status changes to Index, I even do the color decreasing part and stuff but when I save it and try to Load it with unLZ, I have an "Image not indexed" error, and with NSE 2, I have "Image not indexed or used undefined alpha channel." I found some tutorials about creating alpha channels on Photoshop, and I tried everything, even saving it with a PNG 24 format with transparency, but it still doesn't work. The thing I don't like about Irfanview is it screws up the colors, so it's like I have to draw the sprite again, and it sucks. What should I do to get a correctly indexed PNG from Photoshop? Thanks in advance.

If by screwed up you mean the colour in the first index and the background get mixed up, that's supposed to happen.
Here's a step-by-step of how I index with Irfanview.

1. Open the image we want and click "Image>Decrease Color Depth".
2. Select "16 Colors (4BPP)" and click OK.
3. Click "Image>Palette>Edit Palette".
4. Take note of the RGB of the colour in the first square and the square that has your transparent colour.
5. Switch their numbers around and close the menu.
6. Click "Image>Palette>Export Palette". Save this file.
7. Click "File>Reopen".
8. Finally, click "Image>Palette>Import Palette" and select the .pal file from earlier.
9. Save and finish.

When we import our palette, the image doesn't get all messed up.
Hope I helped.