When a cloth is wet, it appears to be darker than it actually is. why does its colour change to a darker shade?
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When something gets wet, it usually appears darker. This can be observed with soil, sand, cloth, paper, concrete, bricks...  What is the reason for this? How does water soaking into the material change its optical properties?
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Just what the title states; and this isn't an original question:  On full-moon, moonlight is almost as bright as mid-dawn; yet there is hardly any colour visible. This is not the case with sunlight.   I'm curious to know why this is the case.
93489
Several weeks ago a darker spot appeared on my screen (as seen in the attached picture, it's right under the "Super User" tab) and it looks as if there was some liquid behind the screen. When I physically press it, it doesn't change its shape and it didn't change its shape since it appeared (around 2 weeks ago). The spot is visible especially on white background and is very weak with black background.  I tried blowing hot air on it and rubbing strong magnet (from a hard disk) but neither helped nor made it change its shape.  Do you have any ideas what could have caused it? Additionally, do you know how could it be fixed besides using my warranty? The laptop is 4 months old, Asus UX530UQ.  Thanks
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In designing websites and applications, I have noticed that when mixing colors with white, certain colors make white look more "greenish" or "purple-ish". This happens to a much greater degree when using tints of white.  As a designer, how can we understand how white is influenced by the colours it is contrasted with?
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What could cause this? f12:    Viewport:    (the f12 has fewer samples, but even when the viewport is at lower samples it looks different..)  I know about color management, but that is at the defaults..    EDIT: oops.. I know 'log' is not a default, but that is because I was fiddling with it. The image above is rendered with 'default'    The material is quite simple, only a translucent shader. (for testing) I even tried appending everything into a new file to reset all the settings, but no difference.  EDIT2: Uploaded blend
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There is a popular belief that wet skin burns or tans faster. However, I've never heard a believable explanation of why this happens.  The best explanation I've heard is that the water droplets on the skin act as a lens, focusing the sunlight onto your skin. I don't see how this would affect an overall burn, because the amount of sunlight reaching the skin is the same (ignoring reflection).  Is this 'fact' true, and if so, what causes it?
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When I dip a paper towel in a cup of water the water gets drawn up due to . How is this reconciled with conservation of energy, as it would seem on the surface that the potential energy of the system has gone up with no work being done?
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A  is formed when a raindrop refracts light, but why then does the whole sky not become a huge rainbow when it rains? Would the light not be dispersed into ordinary white light? What causes it to look as if each end is nearly touching the ground?
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I have an image that I downloaded online:   As you can see it's not just monotone. I would like to change all shades of the red to shades of a different color (Imagine the red liquid was purple instead of red)  Is this possible in Sketch?   Sorry I'm a programmer, so this is kinda outta my realm of expertise. I'm using a Mac.
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I'm creating a scene with large amounts of water that will be readily visible, containing refraction and at various angles. The scene is an indoor long-course swimming pool, about 50 meters, all of which would be seen by a camera above 5 meters above the water's surface. This is being fluid-sim'd, but there are no quickly-moving objects or people, so any water movement is slower and in bulk. The "remove bubbles" option is enabled.  I've tried using a Mix Shader of Refraction BSDF and Reflection BSDF with the factor coming from a Fresnel node, but the results appear either too glossy or too transparent and overly colored. How can I make the water appear realistic? Changes to shaders (refraction to glass)? Or is tweaking colors sufficient?
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This is something that has been irking me for a while, as I've been working on a car project. I'm trying to create a paint (in cycles) similar to the the material in this image:    The problem is, whenever I try to make it, it always comes out looking to diffused or too sharp.  Here's my node setup:    And here's the render:
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I this setup as shown in the screenshot. The image transparency plugs into the mix factor, the transparent and principled nodes plug into the mix shader inputs. I'm trying to figure out how to introduce translucency into the setup. Any help would be appreciated.
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Once I asked this question from my teacher and he replied "Because it passes light.". "And why does it pass light?" I asked and he said, "Because it is transparent.".  The same question again, Why glass is transparent? Why does light pass through it, while for opaque objects, it does not?
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I am using an image texture node as input to the emission node's color (basically, the texture controls the color of the emission).  Unfortunately, when I turn up the brightness of the emission node, the rendered mesh gets brighter and brighter until it's solid white.  I want the color of the mesh to stay the same but the light cast off by it to get brighter, is this possible do? How?
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Often, I'll be driving down the road on a summer day, and as I look ahead toward the horizon, I notice that the road looks like there's a puddle of water on it, or that it was somehow wet. Of course, as I get closer, the effect disappears.  I know that it is some kind of atmospheric effect. What is it called, and how does it work?
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I have seen such an effect being used in many places however I haven't figured out how to replicate it via Photoshop.  I have tried desaturating the image, placing it under a layer of solid colour and then lowering the opacity of the colour. I have also tried a couple of blend modes, to no avail. The effect is nowhere near the same.  Can someone please tell me the effect used on these images?
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Just started using a stainless steel pan. First thing I cooked in it was bacon followed by some fried rice. Stuff stuck to it, but a quick soak and it all came off. However, once I cleaned and dried it there is a kind of gray discoloration on the bottom of the pan. It essentially disappears if it gets wet, but when I dry it, it comes back. First -- is this normal? If not, is there a way to fix it?  First, this is what it looks like dry:    Second, this is what it looks like wet:     It's an .