Grayscale pictures — ZXNet «zx.grafix»

From Stanislav Yudin To All 21 July 2002

Hello everyone! I conducted a series of experiments on Spec and PC and I had a question. Why on The subject is not popular with the Spectrum? True, there can be only four gradations of brightness, but compared to tricolors we have two advantages: 1. Less flickering (50/2 Hz vs. 50/3 Hz) 2. The information content of such a picture is higher, that is, you can take photos of tolerable quality look on Spec. How can you get 4 gradations? On one screen we have black (h) and bright white color (b), and on the second screen we have black (h) and dark white color or otherwise gray (c). With a quick (once per interruption) change of personnel, we have 4 gradations: 1 screen h h b b 2 screen h s h s =============== Brightness 0 1 2 3 О - the darkest "color", 3 - the brightest color. Vertical stripes on Spec in four gradations look quite decent, Four color b/w photos on the PC too. I wanted to write a program today Spec for converting the corresponding images from the PC to Spec, but there is no time enough... Or maybe you can get more gradations if you change three screens? Although it's unlikely whether... Stanislav

From Alexandr Trofimchuk To Stanislav Yudin 23 July 2002

─── du Stanislav ─── Yudin.All SY> How can you get 4 gradations? On one screen we have black SY> (h) and bright white color (b), and on the second screen we have black (h) and SY> dark SY> white color or otherwise gray (c). During a quick (once per interruption) shift SY> frames have 4 gradations: SY> 1 screen h h b b SY> 2 screen h s h s SY> =============== SY> Brightness 0 1 2 3 О - the darkest "color", 3 - the brightest color. I advise you to use two screens of the same brightness - even though there will be dim spots will look a little faded, but the grazing will be gradual and not so drastic. I know this from my practice. ─── Schafft .s(h.

From Alexandr Trofimchuk To Stanislav Yudin 23 July 2002

─── du Stanislav ─── Yudin.All SY> How can you get 4 gradations? On one screen we have black SY> (h) and bright white color (b), and on the second screen we have black (h) and SY> dark SY> white color or otherwise gray (c). During a quick (once per interruption) shift SY> frames have 4 gradations: SY> 1 screen h h b b SY> 2 screen h s h s SY> =============== SY> Brightness 0 1 2 3 О - the darkest "color", 3 - the brightest color. I advise you to use two screens of the same brightness - even though there will be dim spots will look a little faded, but the grazing will be gradual and not so drastic. I know this from my practice. ─── Schafft .s(h.

From Stanislav Yudin To Alexandr Trofimchuk 23 July 2002

Hello Alexandr! 23 Jul 02 00:02, Alexandr Trofimchuk -> Stanislav Yudin: AT> I advise you to use two screens of the same brightness - even light ones AT> places AT> and will look a little faded, but the gradation will be gradual, and AT> not so sharp. I know this from my own practice. Then there will be no gradation at all! There will be black, gray and white. All! scr1 hhbb scr2 bwb color 0123 Colors 1 and 2 will be *the SAME* (bw=bch, and bc<>bch)) and as a result we will not get four gradations, but only three! That is, details highlighted in colors 1 and 2 will merge. And why does anyone need such a grayscale? Stanislav

From Alexandr Trofimchuk To Stanislav Yudin 24 July 2002

─── du Stanislav ─── Yudin.Trofimchuk AT>> gradual, not so abrupt. I know this from my own practice. SY> Then there will be no gradation at all! There will be black, gray and white. SY> That's it! SY> scr1 hhbb SY> scr2 bwb SY> color 0123 SY> Colors 1 and 2 will be *the SAME* (bw=bch, and bc<>bch)) and as a result we SY> we will get not four gradations, but only three! That is, details SY> highlighted colors 1 and 2 will merge. And why does anyone need such a grayscale? Well then you can use screenshots not with different brightes, but with one, but with different ones colors (I saw it once in mist2 there were 2 colors: blue and cyan) they looked quite decent (and smoother if you choose the colors) - you can take photos like this Watch with good quality for Spectrum. ─── Schafft .s(h.

From Alexandr Trofimchuk To Stanislav Yudin 24 July 2002

─── du Stanislav ─── Yudin.Trofimchuk AT>> gradual, not so abrupt. I know this from my own practice. SY> Then there will be no gradation at all! There will be black, gray and white. SY> That's it! SY> scr1 hhbb SY> scr2 bwb SY> color 0123 SY> Colors 1 and 2 will be *the SAME* (bw=bch, and bc<>bc)) and as a result we SY> we will get not four gradations, but only three! That is, details SY> highlighted colors 1 and 2 will merge. And why does anyone need such a grayscale? Well then you can use screenshots not with different brightes, but with one, but with different ones colors (I saw it once in mist2 there were 2 colors: blue and cyan) they looked quite decent (and smoother if you choose the colors) - you can take photos like this Watch with good quality for Spectrum. ─── Schafft .s(h.

From Stanislav Yudin To Alexandr Trofimchuk 25 July 2002

Hello Alexandr! 24 Jul 02 23:05, Alexandr Trofimchuk -> Stanislav Yudin: SY>> Then there will be no gradation at all! There will be black, gray and SY>> white. All! scr1 bwb scr2 bwb color 0123 Colors 1 and 2 will be SY>> *SAME* (bw=bch, and bc<>bch)) and as a result we will not get SY>> four gradations, but only three! That is, the details are highlighted SY>> colors 1 and 2 will merge. And why does anyone need such a grayscale? AT> well then you can use screenshots not with different brights, but with one, but AT> with different colors (I saw once IMHO in mist2 there were 2 colors blue and AT> cyan) they looked quite decent (and smoother if the colors AT> pick up) - you can also look at photographs so that they are good for the Spectrum AT> quality. If you need to get four gradations, and what you propose assumes how If there are four gradations, one brightness, then you can use three screens: 0=black 1=white (or other color) 1 screen: 0111 2nd screen: 0011 3rd screen: 0001 Gradations 0123 However, in this case everything will flicker more strongly, that is, the same tricolor only b/w... Stanislav

From Alexandr Trofimchuk To Stanislav Yudin 25 July 2002

─── du Stanislav ─── Yudin.Trofimchuk AT>> well then you can use screenshots not with different brights, but AT>> one, but with different colors (I saw it somewhere IMHO in mist2 there AT>> 2-colors were blue and cyan) they looked quite decent (and more AT>> smoothly, if you choose the colors) - you can also look at photographs like this AT>> good quality for the Spectrum. SY> If you need to get four gradations, then what do you suggest SY> assumes just four gradations, one brightness, then you can SY> use three screens: maybe you misunderstood... but why not like yours: 1 screen: 0101 blue 2 screen: 0011 cyan ============== 0123 I meant exactly the same, but with a different coloring. ─── Schafft .s(h.

From Stanislav Yudin To Alexandr Trofimchuk 25 July 2002

Hello Alexandr! 24 Jul 02 23:05, Alexandr Trofimchuk -> Stanislav Yudin: AT> well then you can use screenshots not with different brights, but with one, but AT> with different colors (I saw once IMHO in mist2 there were 2 colors blue and AT> cyan) they looked quite decent (and smoother if the colors AT> pick up) - you can also look at photographs so that they are good for the Spectrum AT> quality. Experimented with flowers. The most acceptable quality is obtained if instead of bright white use Magenta-Bright_Off, and instead of white with With the brightness turned off, use Red-Bright_Off. The shades of "gray" become indeed smoother and the flickering is less noticeable, but the picture becomes red with something else... Stanislav

From Alexandr Trofimchuk To Stanislav Yudin 25 July 2002

─── du Stanislav ─── Yudin.Trofimchuk AT>> good quality for the Spectrum. SY> Experimented with colors. The most acceptable quality SY> turns out SY> if instead of bright white you use Magenta-Bright_Off, and instead SY> white with brightness turned off, use Red-Bright_Off. Gradations SY> "gray" colors become really smoother and there is less flickering SY> noticeable, but the picture takes on a red tint with something else... I remember reading somewhere that to look at these pictures better, you need to make them smaller monitor brightness as low as possible, but to still see the image. put on sunglasses. and turn off the lights in an unlit room. ps. at the same time, even 3-color pictures become almost flicker-free. ─── Schafft .s(h.

From Alexandr Trofimchuk To Stanislav Yudin 25 July 2002

─── du Stanislav ─── Yudin.Trofimchuk AT>> good quality for the Spectrum. SY> Experimented with colors. The most acceptable quality SY> turns out SY> if instead of bright white you use Magenta-Bright_Off, and instead SY> white with brightness turned off, use Red-Bright_Off. Gradations SY> "gray" colors become really smoother and there is less flickering SY> noticeable, but the picture takes on a red tint with something else... I remember reading somewhere that to look at these pictures better, you need to make them smaller monitor brightness as low as possible, but to still see the image. put on sunglasses. and turn off the lights in an unlit room. ps. at the same time, even 3-color pictures become almost flicker-free. ─── Schafft .s(h.

From Nikolaj Amosov To Alexandr Trofimchuk 29 July 2002

Hello Alexandr! 25 Jul 02 0:45, Alexandr Trofimchuk -> Stanislav Yudin: [disk error] SY>> if instead of bright white you use Magenta-Bright_Off, and instead SY>> white with brightness turned off, use Red-Bright_Off. Gradations SY>> "gray" colors become really smoother and there is less flickering SY>> noticeable, but the picture takes on a red tint with something else... AT> I remember reading somewhere that it would be better to look at these pictures - it is necessary AT> reduce the brightness of the monitor as little as possible, but what else can you see AT> image. put on sunglasses. and turn off the light in the unlit AT> room. AT> ps. at the same time, even 3-color pictures become almost flicker-free. And almost invisible... Nikolaj

From Alexandr Trofimchuk To Nikolaj Amosov 30 July 2002

─── du Nikolaj ─── Amosov.Trofimchuk AT>> I remember reading somewhere that it would be better to look at these pictures - it is necessary AT>> reduce the brightness of the monitor as little as possible, but what else can you see AT> AT>> image. put on sunglasses. and turn off the lights AT>> unlit room. AT>> ps. at the same time, even 3-color pictures become almost impossible AT>> flickering. NA> And almost invisible... if everything is set up well, it will look fine ─── Schafft .s(h.

From Igor Turashev To Alexandr Trofimchuk 31 July 2002

AT>> reduce the brightness of the monitor as little as possible, but what else can you see AT>> image. put on sunglasses. and turn off the lights AT>> unlit room. AT>> ps. at the same time, even 3-color pictures become almost impossible AT>> flickering. you can look through the clenched fingers of your hand. it turns out almost the same, and looks bad too :)

From Alexandr Trofimchuk To Igor Turashev 1 August 2002

─── du Igor ─── Turashev∙Trofimchuk AT>>> ps. at the same time, even 3-color pictures become almost impossible AT>>> flickering. IT> can be seen through the clenched fingers of the hand. it turns out almost the same IT> most people have their own ways... IT> and it looks bad too :) someone came up with 3-colors, and we suffer, look at them... apparently the best No one has come up with a way to view them, which is a pity... ─── Schafft -s(h-

From Igor Turashev To Alexandr Trofimchuk 3 August 2002

AT> someone came up with 3-colors, but we suffer, look at them... apparently AT> no one has come up with a better way to view them, which is a pity... Well, there is another option - you can assemble a gigaskrin and then you can watch them almost like doublescreen. but this is in theory, in practice - it doesn’t seem to work.

From Alexandr Trofimchuk To Igor Turashev 6 August 2002

─── du Igor ─── Turashev∙Trofimchuk AT>> someone came up with 3-colors, but we suffer, look at them... apparently AT>> no one has come up with a better way to view them, which is a pity... IT> well, there is another option - you can assemble a gigaskrin and then you can have them IT> look almost like a doublescreen. but this is in theory, in practice - IT> doesn’t seem to be the case. read this... and you’ll think that the static screen still rules. only It’s a pity that there are few Artists on ZXNet%(, otherwise it would be beautiful. ─── Schafft -s(h-