Opaque means that pixels do not have any percentage of transparency or translucency. Transparency means that you can see through.
To clone means to replace pixels on area where you paint with pixels from sampled (source) area (first you must choose source area).
We cannot see a light source even if 1 opaque material is blocking the light source. Opaque materials do not allow light to pass through them so we cannot see light through them but we can still see light reflected by them.
We need an source of light, an opaque object blocking the path of light, a screen behind the opaque object.
A source of light and an opaque object.
What you need is a light source and an opaque object to block the light.
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A shadow is cast by an opaque body the opposite side of the body from the source of illumination.
A shadow is cast by an opaque body the opposite side of the body from the source of illumination.
Translucent since it is possible to monitor blood flow and pulse rate by placing a light source and photo detector either side of a finger. Opaque means totally barring the passage of light.
Because something opaque comes between the light source and the surface onto which the light is falling.
A shadow forms whenever there is a source of light and something opaque that stands in front of the light.