Two Images and an API: Everything We Need for Recoloring Products
Apr 15, 2025 am 11:27 AMThis article details a clever method for dynamically changing the color of product images, showcasing different color options without complex SVG or CSS. The technique uses a base image and a "paint" layer, combined with the imgix API for image transformation. This approach is particularly useful for displaying numerous product variations efficiently.
The author, an engineer at CarTrawler, implemented this solution to revamp their car image library. The need to display up to 200 car images simultaneously highlighted the importance of speed and performance, while working across multiple codebases emphasized the need for a simple, scalable solution.
The Process:
-
Base Layer: A high-quality image of the product in a neutral color serves as the foundation. This image should stand alone visually.
-
Paint Layer: A second image, identical in dimensions to the base layer, is created. This layer contains only the areas where color should change dynamically, using a light color (white or light gray) to ensure effective blending with other colors.
-
imgix API: The imgix API is utilized to combine and manipulate the images. Key parameters include:
-
w
: Image width (must be consistent for both layers). -
bri
: Brightness adjustment. -
con
: Contrast adjustment. -
monochrome
: This parameter allows dynamic hex color application. The paint layer's URL is URL-encoded for use within the imgix parameters.
-
-
Layer Stacking: The imgix
watermark
parameter overlays the encoded paint layer onto the base layer.mark-align
ensures proper centering.
The resulting single imgix URL dynamically displays the product in the specified color by simply changing the monochrome
hex value. Examples show the same car rendered in black, blue, green, and red, all from a single, adaptable URL.
This method avoids extensive coding, complex libraries, or front-end modifications, offering a streamlined and efficient solution for dynamically displaying various product color options.
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