Yume2kki: Missing graphical effects in Ocean Subsurface transition + Debug save issue

[purupurupuruin]

Name of the game:

Yume2kki (Version 0.112 Unpatched)

Player platform:

Linux

Attach files (as a .zip archive or link them)

Debug save file
Video showing off bug
easyrpg_log.txt

Describe the issue in detail and how to reproduce it:

EasyRPG Player:

RPG_RT:

When swimming in the area connecting Erratic Pillar Lands to Ocean Subsurface the area is far brighter than it should be and a spotlight-like graphical effect that's supposed to show doesn't appear at all in EasyRPG Player.
I've also attached a video showing this bug.

To reproduce:
Load the provided save and enter Ocean Subsurface by interecting with the drill.
Or head to Ocean Subsurface from Erratic Pillar Lands the normal way.
https://yume2kki.fandom.com/wiki/Ocean_Subsurface

(Apologies for the RPG_RT side of the video being laggy.)

Not related to the missing graphical effects but when loading the debug save I provided in RPG_RT everything's black and there is no collision detection in the Erratic Pillar Lands area, just interact with the part of the drill that's still visible to reach the transition area.
Here's how the debug save looks when loading in EasyRPG Player:

And here's what it looks like when loading in RPG_RT:

[mateofio]

In the second example, different sounds play when you walk.

Also if you open the map in editor, it's all black. If you change the tileset to something else you'll see this map is full of tiles.

So this is likely change tileset bug

[purupurupuruin]

Since I made the debug save in 0.112 I'll add a new set of debug saves that were made in 0.116 here:

debugsavesoceansubsurface0116.zip

Save01 starts in the drill area right before Ocean Subsurface, just press Z after loading to leave the glitch area.
Save05 starts in the cave just before the drill area, press up after loading to leave the cave, for whatever reason you can't move throughout most of the cave without noclip, Urotsuki can walk on most of the purplish brown tiles without noclip. (Not all of them for some reason)
Save06 starts in Erratic Pillar Lands right before the areas that start glitching in debug saves, just press right to enter the cave.

The drill area actually looks more glitched when loading the debug save in RPG_RT in 0.116 compared to 0.112 for some reason:

[purupurupuruin]

I've recorded Ocean Subsurface's scene transition in regular RPG RT:
https://user-images.githubusercontent.com/64451846/117066544-b4713500-acdd-11eb-8736-9a54dfc196e5.mp4

RPG_RT 2003 with a true color patch (Excuse the glitchy text):
https://user-images.githubusercontent.com/64451846/117066563-ba671600-acdd-11eb-9110-8759f35a2e7c.mp4

As well as EasyRPG Player again:
https://user-images.githubusercontent.com/64451846/117066582-bfc46080-acdd-11eb-86b6-82015ecd458d.mp4

After looking through all 3 versions I am pretty sure it isn't just the colors being rendered differently in Player like in #1249, instead it seems like opacity or something is off in comparison to RPG_RT.

Would that be a bug then?

[Mimigris]

The Debug save issue presents here corresponds to this inaccuracy: #3042

[Ghabry]

I extracted the effect and put it on a white map:

The effect is just the same image with opacity 99% overlapped multiple times. Interesting is that RPG_RT shifts into green color.

The reason is imo still 16 bit stuff: For 16 bit images the green channel has 6 bits, the others only 5 bits. Due to different depth of the color channels the "error" increases.

With Maniac patch (left). The colors still do not match 100% match but it is gray now!