AuthorTopic: Pixels And Art Glossary  (Read 134647 times)

Offline Ai

  • 0100
  • ***
  • Posts: 1057
  • Karma: +2/-0
  • finti
    • http://pixeljoint.com/pixels/profile.asp?id=1996
    • finticemo
    • View Profile

Re: [WIP/brainstorm] - Pixels And Art Glossary

Reply #640 on: February 27, 2016, 11:52:47 pm
The one you describe is also shown in the video I linked to under the Color entry. Emphasizing shadow with a complementary color is in fact an extension of that natural perceptual illusion that the shadow appears to be colored to our eyes in reality when it is in fact still a shade of gray.
... I thought the reason that shadows looked blue in sunlight is because they are picking up more atmospheric color (usually blue) than light color. I admit I'm a little skeptical of shadows actually being a shade of grey (though I would agree they can appear grey in low light conditions because of how our eyes work), as I understand light as being multiplicative. Haven't found anything about grey shadows so far, only a lot about colored shadows but I'll watch the video on Color, see if it's explained there.

BTW, I found this while I was looking.
Quote
I see a lot of non-sensical hue shifts in Pixel Art which looks kind of funky/fresh/psychadelic but also starts to feel really cheap and overused.
Sure, I agree. I feel this occurs when the artist is thoughtless or lets the artwork become a technique showcase rather than an artwork.

Quote
So, you're saying Color Shift is arbitrary? Hue Shift refers to one specific optical illusion observable in reality?
No, sorry. I've never heard the term "color shift" before, inside or outside pixelation TBH. I'm just saying that hue shifts don't have to look weird, and they do occur naturally (and come to think of it, are also a nice approximation of materials with subsurface scattering like skin)

AlexHW's point also seems good, if there is space to compare monochromatic, hue shifted, and excessively hue shifted ramps in an entry, that may communicate the idea well.

Quote
I believe people will always find this confusing no matter what because there is no consistency in these terms across different color models and no consistency with their common sense interpretation either.
Excellent point. I guess as long as you avoid explicitly calling the HSL L by its actual long name 'lightness', confusion will be minimized.

« Last Edit: February 28, 2016, 12:15:26 am by Ai »
If you insist on being pessimistic about your own abilities, consider also being pessimistic about the accuracy of that pessimistic judgement.

Offline 0xDB

  • 0011
  • **
  • Posts: 873
  • Karma: +0/-0
  • Dennis inter-is.
    • dennisbusch_de
    • http://pixeljoint.com/p/1287.htm
    • 0xdb
    • View Profile
    • 0xDB

Re: [WIP/brainstorm] - Pixels And Art Glossary

Reply #641 on: February 28, 2016, 01:13:12 pm
In Photography, Color Shift is synonymous to Color Cast, where it refers to an (usually unwanted) effect that all colors shift towards one specific different color/hue (caused by lack of or improper white balance). From a descriptive point of view however, I don't feel a huge difference between saying "color shifts from a to b" or "hue shifts from a to b" except maybe that saying "hue" is more narrow referring to that one specific property of a color, while "color" encompasses a wide variety of properties that might get shifted.

I know of monochromatic gradients but what are achromatic gradients? Grayscale? (Achromatic color appears to mean color "without color"... so gray?). Gradients/Ramps containing a shift in Hue would be called what, inter-chromatic or polychromatic, or is there a specific term (apart from Hue Shift)?

Offline 0xDB

  • 0011
  • **
  • Posts: 873
  • Karma: +0/-0
  • Dennis inter-is.
    • dennisbusch_de
    • http://pixeljoint.com/p/1287.htm
    • 0xdb
    • View Profile
    • 0xDB

Re: [WIP/brainstorm] - Pixels And Art Glossary

Reply #642 on: February 28, 2016, 02:07:20 pm
I clearly need to update my knowledge about colored shadows.

Offline AlexHW

  • 0100
  • ***
  • Posts: 1037
  • Karma: +0/-0
    • View Profile
    • AlexHW

Re: [WIP/brainstorm] - Pixels And Art Glossary

Reply #643 on: February 28, 2016, 07:10:19 pm
My understanding is that Dichromatic gradient is one that translates from one color to another, since Di means two. Then there's Trichromatic(three different colors on a colorwheel). Polychromatic means multiple colors, and generally refers to images that use multiple colors. I suppose you could have a polychromatic gradient, but this would involve basically two dichromatic gradient stuck together? I learnt about monochromatic gradients and achromatic gradients in general art before I learnt about pixel-art, so I'm more attached to that way of classifying things and might be a way to bridge things with general art.
They are classed under the types of Value Scales.
Also, one thing I'm unsure about is whether there is a better term for gradients that begin with a strong color and transition to an achromatic color. Because achromatic gradients tend to refer to gradients that lack any color/hue, even though you could probably put colors that are near grey into it and still call it achromatic (because there are achromatic colors).

« Last Edit: February 28, 2016, 08:25:16 pm by AlexHW »

Offline Ai

  • 0100
  • ***
  • Posts: 1057
  • Karma: +2/-0
  • finti
    • http://pixeljoint.com/pixels/profile.asp?id=1996
    • finticemo
    • View Profile

Re: [WIP/brainstorm] - Pixels And Art Glossary

Reply #644 on: February 29, 2016, 03:16:36 am
It looks like possibly Alex meant a different thing by 'monochromatic' gradient than my interpretation. Typically I think of a monochromatic gradient as what you get if you lay down a panel of color, then use Blend tool in Multiply mode to progressively darken it with a greyscale gradient -- ie. a gradient in which all colors have the same hue and saturation.

(This doesn't always happen because blend modes and especially color spaces are imperfect, but that's the general idea)

Personally I'd be inclined to say that color -> grey or grey -> color gradients have rather marginal usefulness in pixel art. (painting and cinematics are a different story)
« Last Edit: February 29, 2016, 05:25:01 am by Ai »
If you insist on being pessimistic about your own abilities, consider also being pessimistic about the accuracy of that pessimistic judgement.

Offline AlexHW

  • 0100
  • ***
  • Posts: 1037
  • Karma: +0/-0
    • View Profile
    • AlexHW

Re: [WIP/brainstorm] - Pixels And Art Glossary

Reply #645 on: February 29, 2016, 05:04:14 am
It looks like possibly Alex meant a different thing by 'monochromatic' gradient than my interpretation.
The way you describe it is how I'd view it.
From what I gather, adding white to a color "Tints" it. Adding black "Shades" it. Adding grey "Tones" it.
Any Dichromatic gradient basically is a shift of hue, since both ends have different hues. The Dichromatic gradient doesn't need to be tinted, shaded, or toned- but it could be?

Offline 0xDB

  • 0011
  • **
  • Posts: 873
  • Karma: +0/-0
  • Dennis inter-is.
    • dennisbusch_de
    • http://pixeljoint.com/p/1287.htm
    • 0xdb
    • View Profile
    • 0xDB

Re: [WIP/brainstorm] - Pixels And Art Glossary

Reply #646 on: February 29, 2016, 11:01:59 am
Well...

These last couple of post illustrate well how very easy it is to get lost in details and straying from the goal to provide brief descriptions. The initially provided generalization for Color Gradient/Ramp/Shift already covers all cases discussed in these last posts(not necessarily by any well known name) and serves its purpose of providing an entry point to that particular topic (and there's always the "further reading" links as well).

So there is no need for changing the general case and I'm adding the new terms provided as seperate entries, linking to existing descriptions on wikipedia. It is better to have narrower, specialized entries for individual types of gradients(or rather terms as these terms are not restricted to use in gradients) instead of overloading the elegant simplicity of the generalization with these details.

Since the goal of the Glossary is to stay descriptive in nature, giving examples for different gradients/ramps and providing an assessment/judgement of/about their usefulnes in Pixel Art is left as something for a tutorial on choosing colors, making a pallette, coming up with a color scheme (I personally have no plans at the moment to write any tutorials).

Dichromatism and Polychromatism, as researching on the web suggests, appear to already refer to a very specific phenomenon where the hue of something appears different based on thickness and concentration (e.g. the intensifaction of yellow and blue water as it shifts to a different hue as described in the Color entry). I feel that might be too specialized to be mentioned at all. Not that I think anything is irrelevant when it comes to Visual Art/Crafting but the scope of this Glossary should probably be limited or otherwise we might as well just provide a link to the Wikipedia starting page (or google) and be done with it.

these entries have been added/changed:

Achromatic Color
Literally a color "without color", which is all shades of gray and black and white.
Practically all colors without a strong perceptual chromaticity are called achromatic.
https://en.wikipedia.org/wiki/Color_scheme#Achromatic_colors
https://en.wikipedia.org/w/index.php?title=Achromatic_color&redirect=no (redirects to Grey at time of writing this)

Color
+ https://en.wikipedia.org/wiki/Complementary_colors

Color Scheme
https://en.wikipedia.org/wiki/Color_scheme

Monochromatic Color
All tints, tones and shades of equal hue.
https://en.wikipedia.org/wiki/Color_scheme#Monochromatic_colors
https://en.wikipedia.org/wiki/Monochromatic_color

Offline 0xDB

  • 0011
  • **
  • Posts: 873
  • Karma: +0/-0
  • Dennis inter-is.
    • dennisbusch_de
    • http://pixeljoint.com/p/1287.htm
    • 0xdb
    • View Profile
    • 0xDB

Re: [WIP/brainstorm] - Pixels And Art Glossary

Reply #647 on: March 02, 2016, 08:15:26 pm
Most entries in the opening post now have at least a brief summary and/or links to vast amounts of information on everyones favorite open encyclopedia.

Offline 0xDB

  • 0011
  • **
  • Posts: 873
  • Karma: +0/-0
  • Dennis inter-is.
    • dennisbusch_de
    • http://pixeljoint.com/p/1287.htm
    • 0xdb
    • View Profile
    • 0xDB

Re: Pixels And Art Glossary (v.0.5)

Reply #648 on: March 04, 2016, 12:48:22 pm
Entries in opening post now have anchor and iurl tags and there is an index at the top for quickly grabbing links to individual terms.
(I'll eventually have to cut the duplicate text under the images because of the 50000 chars per post limit.)

Offline questseeker

  • 0010
  • *
  • Posts: 112
  • Karma: +0/-0
    • View Profile

Re: Pixels And Art Glossary (v.0.5)

Reply #649 on: March 04, 2016, 03:25:45 pm
I'd expect more entries about techniques and patterns found both in tools and workflows and in images. Here's a first draft of two important ones:

Pillow Shading
Unrealistic shading of a smoothly curved object by distributing light and dark colors according to the shape of the object's outline instead of imagining and matching the shape of actual isophotes and the location of highlights; this normally results in approximately parallel and constant width color bands from the outline inwards, vastly different from the bunched up, interrupted, expanded and nonconvex shapes of correct shading.
A rectangular pillow is one of the rare cases in which the incorrect but easy procedure sometimes approaches a correct result.

Index Painting
Editing palette indexes instead of pixel colors; it implies caring about palette organization (two palettes with the same colors in a different order are different) and not only about limiting the available colors.

Deliberate attention for building the final image through an explicit indirect mapping mechanism can have a variety of benefits and purposes, mostly related to determining actual colors after editing the image:
  • Making images that can be displayed with different but "parallel" palettes (as typical of many videogames with recolored sprites, which can be implemented with a simple palette swap).
  • Distinguishing palette indexes in order to treat identical colors as logically different, for example because they are shades in different color ramps.
  • Caring about the use of palette entries rather than their actual color (e.g. "I need three entries for flesh, eyes and pupils and I'll reuse hair colors for irises" vs. "I need three entries for rosy pink, blueish white and pure black"); palette structure can be more important and more stable than the contained colors.
  • Controlling palette indices exactly (as opposed to letting the paint program manage them automatically) because they also have some conventional meaning: transparency (e.g. index 0 is transparent), metadata about a game sprite such as whether a pixel is a solid part of an object, special display-time palette tricks (e.g. indexes in a certain range are subject to color cycling) and so on.
  • Allowing use of tools, like semi-transparent brushes, compositing transparent layers, blurring, etc. that are fundamentally unsuitable for simple palette-based image representations. For example, editing a high bit depth greyscale image and mapping grey ranges to palette colors, as popularized by Dan Fessler (1,2).

1. http://www.danfessler.com/blog/pixel-purism-process-vs-results
2. http://www.danfessler.com/blog/hd-index-painting-in-photoshop