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Image Pixel Reader

Tool to read the color of a pixel in an image and extract the red, green, blue values or to extract all the pixels of the same color in an image.

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Image Pixel Reader -

Tag(s) : Image Processing

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Image Pixel Reader

Pixel Reader

  [X]



See also: Image Histogram

Pixel Extractor

  [X]

See also: Image Histogram

Tool to read the color of a pixel in an image and extract the red, green, blue values or to extract all the pixels of the same color in an image.

Answers to Questions

How to read a pixel in an image file?

The image must be in a readable format (JPG, PNG, GIF are the most common) and have a non-vector format in order to extract information on their width (number of columns) and height (number of lines).

The pixel reading is usually a number, it can be associated with a table of contents (if the colors are indexed) or with an N-bit value (usually 24 bits).

This number can then be translated into 3 components: Red, Green and Blue.

Example: The number 16711680 (which is written ff0000 in hexadecimal) corresponds to the color red, it has two components: 255 (FF) Red, 0 (00) Green and 0 00 Blue.

How to extract pixels from an image?

Read each pixel, one by one, by row or by column and note the position of the pixels corresponding to a criterion.

To extract all the pixels having a given color, read all the values of each pixel and note their coordinates (rows, columns).

How to read a transparent color?

Colors can integrate an alpha channel (called transparency channel), and although the color is totally invisible (transparent) it can contain a color.

Source code

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