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Watermark
Screen Tip
Use the 'alt' attribute. Eg ""
It refers to how "crisp" or clear and image / the quality of an image is.
Pixels refer to tiny illuminations in an image. These little illuminations show up on displays because when they come together to make an image.
The common name for these is "Smart Board"
contrast ratio
You must first place another image from Image > Place or drag from another document, then click on layer with image (layer with image which you want behind) on LAYERS palette and drag it below layer with image to be above.
Signifier is the image....signified is the concept behind the image
Pop- up Text
It displays the world as flat and rectangular when it is really round, so the image is distorted.
behind you