Python qr code reader from image code#
If it is deformed, the QR Code's error correction function is invoked where even a tiny missing or smeared part renders the reading operation impossible, or the response of the operation may become slow.ĭENSO WAVE recommends that you use the QR Code following the specifications in the JIS or ISO standard to assure stable reading of the QR Code.įurthermore, if the QR Code is overlaid with an illustration or design, the resultant code may not be called a QR Code any longer, because there is no standard for doing this kind of operation. Users of QR Code must be careful about deforming the code by overlaying it with an illustration or putting a a design on it. It is all right to use QR Codes with colors or an inserted illustration? Note that superimposing an image on a QR code is not officially recommended. It is easy to embed the image into the QR code. Paste another image into an image with Python, Pillow.or the #xxxxxx style.įor more information about paste(), see the following articles: Specify fill_color and back_color using color names black, white, red, etc. You can set the color with the fill_color and back_color of the make_image() method.
The default value is 4, which is the minimum width in the specification. The number of pixels in the margin width is box_size * border. You can use border to set the width (number of cells) of the outer margin. With box_size, you can set the size of the cell (square black and white dot) in pixels.Įven if version is the same (the number of cells is the same), you can change the size of the generated image by changing box_size. When generating a QR code image from string of the same length, increasing the error correction level increases the size of the generated QR code image. Error correction feature | | DENSO WAVE._CORRECT_H (Approx 30%)įor more information about the QR code error correction feature, refer to the official page of Denso Wave below.
The values in parentheses indicate error correction ability (error correction rate for all codewords). You can set the error correction level with error_correction. Note that even if you specify a smaller version, if the data does not fit, it will automatically be the minimum version that fits the data. The minimum value of version is 1, and the maximum is 40.īy specifying version, you can generate a QR code image larger than the optimal version (minimum size), so it is useful when you want to create multiple QR codes with different data contents with the same size.
QR code version of the generated image: version
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