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Stable Diffusion WebUI Aspect Ratio selector

Extension for AUTOMATIC1111/stable-diffusion-webui adding image aspect ratio selector buttons.

Updates

  • 20/02/2023 ⚠️ this update will remove your local config files (aspect_ratios.txt and resolutions.txt) and it will create new default ones. These can be then modified freely and preserved in the future. For more info read here.

Install

Browse to the Extensions tab -> go to Install from URL -> paste in https://github.com/alemelis/sd-webui-ar -> click Install

Here's how the UI looks like after installing this extension

Screenshot 2023-03-30 at 20 37 56

Usage

  • Click on the aspect ratio button you want to set. In the case of an aspect ratio greater than 1, the script fixes the width and changes the height. Whereas if the aspect ratio is smaller than 1, the width changes while the height is fixed.
  • Reset image resolution by clicking on one of the buttons on the second row.

Configuration

Aspect ratios can be defined in the /sd-webui-ar/aspect_ratios.txt file. For example,

1:1, 1.0
3:2, 3/2
4:3, 4/3
16:9, 16/9
# 6:13, 6/13
# 9:16, 9/16
# 3:5, 3/5
# 2:3, 2/3
# 19:16, 19/16 # fox movietone
# 5:4, 5/4 # medium format photo
# 11:8, 11/8 # academy standard
# IMAX, 1.43
# 14:9, 14/9
# 16:10, 16/10
# 𝜑, 1.6180 # golden ratio
# 5:3, 5/3 # super 16mm
# 1.85, 1.85 # US widescreen cinema
# DCI, 1.9 # digital imax
# 2:1, 2.0 # univisium
# 70mm, 2.2
# 21:9, 21/9 # cinematic wide screen
# δ, 2.414 # silver ratio
# UPV70, 2.76 # ultra panavision 70
# 32:9, 32/9 # ultra wide screen
# PV, 4.0 # polyvision

Note the # marking the line as a comment, i.e. the extension is not reading that line. To use a custom value, un-comment the relative line by removing the starting #. A custom aspect ratio is defined as button-label, aspect-ratio-value # comment. It is recommended to set the aspect-ratio-value to a fraction, but a float or int will work as well. The # comment is optional. The button-label will be displayed inside the button. It can be anything you like.

Resolutions presets are defined inside resolutions.txt file,

1, 512, 512 # 1:1 square
2, 768, 512 # 3:2 landscape
3, 403, 716 # 9:16 portrait 

The format to be used is button-label, width, height, # optional comment. As before, lines starting with # will be ignored.

Calculator Panel

Use the calculator to determine new width or height values based on the aspect ratio of source dimensions.

  • Click Calc to show or hide the aspect ratio calculator
  • Set the source dimensions:
    • Enter manually, or
    • Click ⬇️ to get source dimentions from txt2img/img2img sliders, or
    • Click 🖼️ to get source dimensions from input image component on the current tab
  • Click ⇅ to swap the width and height, if desired
  • Set the desired width or height, then click either Calculate Height or Calculate Width to calculate the missing value
  • Click Apply to send the values to the txt2txt/img2img sliders

Basic usage of aspect ratio calculator

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Select img aspect ratio from presets in sd-webui

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