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e197c7b29d
To sort an image's colors from darkest to lightest, you can then do:
```handlebars
{{ {{ $colorsByLuminance := sort $image.Colors "Luminance" }}
```
This uses the formula defined here: https://www.w3.org/TR/WCAG21/#dfn-relative-luminance
Fixes #10450
70 lines
2.3 KiB
Go
70 lines
2.3 KiB
Go
// Copyright 2024 The Hugo Authors. All rights reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package images
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import (
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"image"
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"github.com/gohugoio/hugo/resources/images/exif"
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"github.com/gohugoio/hugo/resources/resource"
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)
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// ImageResource represents an image resource.
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type ImageResource interface {
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resource.Resource
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ImageResourceOps
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}
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type ImageResourceOps interface {
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// Height returns the height of the Image.
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Height() int
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// Width returns the width of the Image.
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Width() int
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// Process applies the given image processing options to the image.
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Process(spec string) (ImageResource, error)
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// Crop an image to match the given dimensions without resizing.
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// You must provide both width and height.
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// Use the anchor option to change the crop box anchor point.
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// {{ $image := $image.Crop "600x400" }}
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Crop(spec string) (ImageResource, error)
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// Fill scales the image to the smallest possible size that will cover the specified dimensions in spec,
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// crops the resized image to the specified dimensions using the given anchor point.
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// The spec is space delimited, e.g. `200x300 TopLeft`.
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Fill(spec string) (ImageResource, error)
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// Fit scales down the image using the given spec.
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Fit(spec string) (ImageResource, error)
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// Resize resizes the image to the given spec. If one of width or height is 0, the image aspect
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// ratio is preserved.
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Resize(spec string) (ImageResource, error)
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// Filter applies one or more filters to an Image.
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// {{ $image := $image.Filter (images.GaussianBlur 6) (images.Pixelate 8) }}
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Filter(filters ...any) (ImageResource, error)
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// Exif returns an ExifInfo object containing Image metadata.
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Exif() *exif.ExifInfo
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// Colors returns a slice of the most dominant colors in an image
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// using a simple histogram method.
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Colors() ([]Color, error)
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// For internal use.
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DecodeImage() (image.Image, error)
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}
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