Blue/green display issues

[Tangentg]

I just tried Supercharger Frogger on Stella yesterday and the frog was blue/cyan.

 

However, when I looked at the screenshots on AtariAge, it showed the frog as green.

 

This blue/green problem seems to be common too: the screenshots of Atlantis show the water being green as opposed to blue, and Inky from Pacman Collection on the 7800 is green on emu7800 (the emulator) and cyan/blue in ProSystem.

 

I tried meddling around with TV effects, PAL-color loss, NTSC/PAL, and TIA palettes, but nothing can make the frog green...

 

So, how are they getting the blue to be green in those screenshots? What can I do to make the frog look green? Or is the frog meant to be cyan in Supercharger Frogger?

[Keatah]

The screenshots are likely from an older version of stella or a different emulator altogether, I don't know.

 

I currently use a Hue of 44-46, Saturation 77, Gamma 44, Brightness 50, Contrast 50. And it looks pretty spot-on. Incidentally the settings also take away violet/purple tinge of Video Pinball's playfield.

 

Emulator authors always proclaim their stuff generates the exact precise colors specified by math, circuit and timing diagrams, and NTSC specification and all that, that's almost never true. They're close, but you have to dial them in. Once set, you'll never need to change it. It'll remain consistent across everything.

 

I had a similar problem in Altirra and the shields in StarRaiders being green, they're supposed to be a foggy blue. And in some later version, after a lot of technobabbly discussion, the problem was quietly fixed or something. Because they now render blue - with a minor fine tweak to the saturation for my taste.

Edited September 15, 2016 by Keatah

[Tangentg]

I currently use a Hue of 44-46, Saturation 77, Gamma 44, Brightness 50, Contrast 50. And it looks pretty spot-on. Incidentally the settings also take away violet/purple tinge of Video Pinball's playfield.

If I were to attempt this on Stella, where would I set this? Assuming the "spot on" refers to making the blue green, though I'd prefer to have the frog green but Atlantis blue so many something in between when I try this myself.

 

Edit: Ah I found some of these on the TV effects tab. I'll try it out.

I was able to make the frog green now. Thanks.

Edited September 15, 2016 by Tangentg