DPI Explained Image
Attempting to write a DPI definition led me to:
DPI (dots), PPI (dots), LPI (lines) all refer to the same concept, which is hereinafter referred to as DPI.
DPI is a device-specific measurement. It says, "This is the permission of this device."
Vector files are not tied to any DPI (they expand and contract to fit a specific resolution).
When this vector file is displayed in "bitmap" format - (bmp, png, tiff, jpg) etc ... this "bitmap" file is generated at a specific DPI for printing (or displaying) banding "or" scanline ", which are displayed at that particular DPI.
Now some have argued that DPI does not exist in bitmap files.
I am looking for DPI definition and how or why can it be considered not existing in a bitmap?
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Since the bitmap has no physical size, it has no dpi. If you have a file format where the physical size is modeled, you can have (modeled) dpi.
You might want to differentiate between targeting and scope. If the point is not square, but a circle, the area covered is larger.
btw LPI is a different but related concept. A 100 LPI screen for a 600 DPI printer means there are 6 * 6 pixel squares to create 37 different gray levels (with 0-degree rotation).
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The bitmap will point every point and leave DPI and hence rendering to some other part of the system. I could paint sixteen by sixteen bitmaps on a wall with a projector and require one dpi. More advanced file formats will dictate how to display them because they care about how they look.
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If the bitmap has a DPI, we can print / display it as "intended" if we also know the DPI of the display / printer.
I think I need to think less about DPI and more about estimated cm / inch. One nice thing about DPI is that it can give us an estimate of how good the result will look.
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