Author Topic: New Lost Legends II screenshots (Read 12959 times)

JonimusPrime · « **Reply #15 on:** November 13, 2007, 03:50:00 pm »

It depends on how they are doing the gray scale but the reason light gray flickers the most noticeably is because of the fact that is is on the screen for the shortest amount of time.

TIfanx1999 · « **Reply #16 on:** November 13, 2007, 04:05:00 pm »

Light gray would be on the screen the shortest amount of time? That doesnt make any sense to me. with 4 level gray there are 3 layers arent there? IIRC; for light gray you would have 2 layers of white and one of black, and for dark gray 2 layers of black and one of white. I could be wrong though as I'm not all that familar with grayscale but i thought that's how it was done. :

:

Liazon · « **Reply #17 on:** November 13, 2007, 04:13:00 pm »

QuoteBegin-Ranman+13 Nov, 2007, 20:18-->

QUOTE (Ranman @ 13 Nov, 2007, 20:18)

On the 68K calcs, light gray tends to be the color that is very susceptible to flickering. It is not that noticable in small amounts, but large amounts of contiguous light gray may be hard on the eyes. Do the Z80 calcs experience the same thing?

Hopefully, I won't get chastised too much for my thoughts this time.

I think so. I duno whether 68ks use an interlaced routine, but the z80s flicker a bit but not too bad on the light gray. RGP masks bytes so it's not like you're switching between entire layers. you're switching between every other pixel i think. not sure which masks Jim used, but it's close to being that.

@art_of_camelot:

I think you're a bit confused. For gs, you show the dark layer for twice as long as the light layer. what ever is on the dark layer looks darkgray, and whatever is on the light layer is light gray.

JonimusPrime · « **Reply #18 on:** November 13, 2007, 04:13:00 pm »

NO you can do it with two layers and then just have one layer on the screen for 2/3 of the time allowing you to have white light gray dark gray and black.
Edit Liazon beat me

TIfanx1999 · « **Reply #19 on:** November 13, 2007, 04:22:00 pm »

Ah, ok. So using 2 layers is the standard? And for light gray u just display it for a lesser duration?Hmm... I really need to study up on grayscale

Liazon · « **Reply #20 on:** November 13, 2007, 04:25:00 pm »

it's all an illusion ^^

note that real grayscale LCDs don't need to do this. we have to do this because calc LCDs only support black and white. it's a pretty good illusion i must say ^^

TIfanx1999 · « **Reply #21 on:** November 13, 2007, 04:53:00 pm »

Ya, i know. Would be nice if they gave as a pallet of gray. Heck even the old gameboy had a 4 shade pallet of gray (green ^_^).

P.S. I've heard the new ti inspire does, but as it isn't programmable it doesnt count

AaroneusTheGreat · « **Reply #22 on:** November 13, 2007, 05:34:00 pm »

Not programmable yet I emailed them a while back and their PR person told me they were planning it, but they needed to improve the operating system first, so don't discount it yet. Hopefully they weren't lying to me or something :knight:

This lost legends thing looks freaking amazing, I must say.

nitacku · « **Reply #23 on:** November 13, 2007, 06:27:00 pm »

I'm going to see if I can create 4 lvl grey in basic now :lol:

JonimusPrime · « **Reply #24 on:** November 13, 2007, 06:29:00 pm »

Uh.. Four level in basic will be really hard but maybe doable if you can make it fast enough.

DJ Omnimaga · « **Reply #25 on:** November 13, 2007, 06:51:00 pm »

the hard part is to draw the sprites, cuz it works a bit like in ASM. The grayscale need to be dithered so the flickering effect is less visible. However, in BASIC you need to dither the sprites manually and store each layers possible (3 for 4 levels, 4 for 5 levels, etc) in pictures, then switch through them quickly. However doing the dithering by hand is a total hassle

The last time I tried there was no speed difference though, but at 5 levels it flickers a lot on the 83+ black edition and it starts to make a whole load of pics. I recommend staying with 3 or 4 level for BASIC.

TIfanx1999 · « **Reply #26 on:** November 14, 2007, 07:02:00 am »

QUOTE

Not programmable yet I emailed them a while back and their PR person told me they were planning it, but they needed to improve the operating system first, so don't discount it yet. Hopefully they weren't lying to me or something

LIES! ALL LIES!

It would be REALLY nice if they made it programmable, in additon to the grayscale (built in) I think it had a very high res display as well.

Zera · « **Reply #27 on:** November 14, 2007, 08:05:00 am »

Don't worry, Ranman -- I've had a lot of concerns about my choice of grayscale. While it's something I would like to do, I still have to go through some testing to see if it's plausible. If not, I'll get around to making some changes.

DJ Omnimaga · « **Reply #28 on:** November 14, 2007, 09:31:00 am »

light gray on 89t flickers very bad if contrast is set too high, on 83+ series it doesnt because of the way grayscale is drawn. On 68k you just flash between two layers quiclky to create gs effect and the light gray one is shown for a shorter amount of time. On 83+ gs is interlaced so its barely visible unless you have a crappy LCD driver like leofox and threefingeredguy

Halifax · « **Reply #29 on:** November 14, 2007, 09:57:00 am »

Yeah, why has no one tried interlaced grayscale on the 68K? (I have always wondered this)

Either way, good question Ranman.

Yes the NSpire will be programmable, but don't think it is anything close to low-level. There will be no ASM, BASIC, C, or C++, but instead it will be programmable with Java/C# running on a VM.

Which I have heard can be pretty slow with the Nspire.

(All this information comes straight from a TI Nspire OS developer.)