comfy-qr

A set of ComfyUI nodes to dynamically create QR image layers for generative QR art without the hassle of leaving the webui.

This repository is managed publicly on Gitlab, but also mirrored on Github. Please submit any issues or pull requests to the gitlab repo.

Getting started

This project currently contains two nodes for generating QR codes.

QR Code

A dynamically sized QR code without any resampling scaled by the text length, the module size, and the error correction level.

Inputs

• protocol - If enabled this will prefix the textbox input with a preset to represent the internet protocol. This is included both for convenience and as a workaround for the textbox clipping strings with this character combination.
  • Http - Adds "http://" before the text.
  • Https - Adds "https://" before the text.
  • None - Uses only the contents of the text box.
• text - What text to build your QR code with. If protocol is specified, this textbox will be combined it with the selected option.
• module_size - The pixel width of the smallest unit of a QR code.
• max_image_size - The maximum size of the resulting QR code. If the combination of text, module_size, and error_correction create dimensions that exceed this, an error will halt the pipeline.
• fill_hexcolor - A string of characters representing the hex value of the QR units. Can be 3 or 6 hexadecimal characters with an optional # before.
• back_hexcolor - A string of characters representing the hex value of the space around the QR units. Can be 3 or 6 hexadecimal characters with an optional # before.
• error_correction - The level of error correction to apply.
  • Low - 7% error correction.
  • Medium - 15% error correction.
  • Quartile - 25% error correction.
  • High - 30% error correction.
• border - The border size (In multiples of module widths)

Outputs

• IMAGE - The QR code
• QR_VERSION - An integer of the QR version that was selected based on the text length and error correction level.
• IMAGE_SIZE - An integer based on the pixel width of the resulting QR code.

QR Code (Conformed to Image Size)

A QR code fixed to specific output dimensions through image resampling.

Inputs

• protocol - If enabled this will prefix the textbox input with a preset to represent the internet protocol. This is included both for convenience and as a workaround for the textbox clipping strings with this character combination.
  • Http - Adds "http://" before the text.
  • Https - Adds "https://" before the text.
  • None - Uses only the contents of the text box.
• text - What text to build your QR code with. If protocol is specified, this textbox will be combined it with the selected option.
• image_size - The pixel dimensions to conform the QR code to.
• fill_hexcolor - A string of characters representing the hex value of the QR units. Can be 3 or 6 hexadecimal characters with an optional # before.
• back_hexcolor - A string of characters representing the hex value of the space around the QR units. Can be 3 or 6 hexadecimal characters with an optional # before.
• error_correction - The level of error correction to apply.
  • Low - 7% error correction.
  • Medium - 15% error correction.
  • Quartile - 25% error correction.
  • High - 30% error correction.
• border - The border size (In multiples of module widths)
• resampling - The resampling algorithm to use when rescaling the QR code.
  • Bicubic - Bicubic interpolation
  • Bilinear - Bilinear interpolation
  • Box - Box interpolation
  • Hamming - Hamming interpolation
  • Lanczos - Lanczos interpolation
  • Nearest - Nearest Neighbor interpolation

Outputs

• IMAGE - The QR code
• QR_VERSION - An integer of the QR version that was selected based on the text length and error correction level.

Future updates

If the solution is clean enough, I plan on implementing a node that will automatically generate a mask to extract the 3 QR markers (based on module_size, border, and QR_VERSION) for more advanced workflows.