A hot pixel is a bright or stuck pixel that is always on, while a dead pixel is a dark or unlit pixel that is always off.
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Photoshop is a raster/pixel-based program, and is also a product you have to purchase. Inkscape is a vector drawing program that's free.
Pictures of screens can look weird because of the way cameras capture light and display technology works. The camera may not be able to accurately capture the screen's brightness and colors, leading to distortions in the image. Additionally, the screen's refresh rate and pixel structure can cause visual artifacts in the photo.
The recommended 16x20 pixel size for images on social media platforms is too small for most platforms. It is recommended to use larger dimensions, such as 1200x630 pixels for optimal display quality.
To calculate the pixel size of an image, you need to divide the width or height of the image in pixels by the physical size of the image in inches. This will give you the pixel size per inch.
The equivalent pixel resolution of an image at 300 dpi is 300 pixels per inch.