What is Image Resizing?
Image resizing adjusts an image's dimensions in pixels. This can mean shrinking an image to save storage or bringing it to specific dimensions required by a platform or print format.
An image's resolution determines how many pixels it contains. More pixels mean more detail but also larger files. Shrinking removes pixels, while enlarging must calculate new pixels, often resulting in blurriness.
Formidex offers two input modes: pixel values or percentage values. You can lock the aspect ratio to prevent distortion or unlock it to achieve specific dimensions.
How does Image Resizing work?
When scaling, each pixel of the new image is calculated from surrounding pixels of the original. Formidex uses the browser's Canvas API, which employs bilinear interpolation. When shrinking, multiple pixels are combined into one; when enlarging, new intermediate values are calculated.
The aspect ratio lock option ensures width and height are changed proportionally. When you change the width, the height is automatically adjusted and vice versa. This prevents distorted images.
Tips for best results
Keep the aspect ratio locked unless you specifically need a different format. Distorted images look unprofessional and are immediately noticeable.
Downscaling always works well since it only discards existing information. Upscaling beyond original dimensions creates blurriness. If you need significantly larger images, use the AI upscaling tool instead.
Use percentage mode when you want to scale multiple images uniformly. This ensures all images are scaled by the same factor regardless of their original dimensions.
Common use cases
Adapt images for social media: each platform has its own recommended image sizes. Instagram posts work best at 1080x1080 pixels, Facebook covers need 820x312 pixels. Resizing lets you quickly reach the right dimensions.
Reduce file size: a 4000x3000 pixel photo from a modern camera is often several megabytes. For web use, a width of 1200 to 1920 pixels usually suffices, drastically reducing file size.
Uniform image sizes for galleries and shops: in product catalogs or image galleries, all images should have the same dimensions. Resizing brings different source formats to a common standard.