Learn how to set your image size and resolution in Photoshop:
Resampling alters the amount of image data as you change the pixel dimensions or resolution of an image.
- Decreasing resolution: Reduces the number of pixels, discarding image information.
- Increasing resolution: Increases the number of pixels, adding new pixels to the image.
Interpolation Methods:
When resampling, you need to define an interpolation method to determine how pixels will be added or removed. This choice impacts the final image quality.
- Nearest Neighbor: Fast but less accurate method. Replicates original pixels, ideal for images with sharp edges and to reduce file size. However, it can produce irregular results when resizing.
- Bilinear: Calculates the average of the colors of adjacent pixels to create new pixels. Produces average quality results.
- Bicubic: Slower but more accurate method. Analyzes the color values of surrounding pixels to create new pixels. Generates smoother gradients than Nearest Neighbor and Bilinear.
- Bicubic Smoother: Ideal for enlarging images, providing smoother results.
- Bicubic Sharper: Ideal for reducing image size while preserving details.
Tips:
- Avoid unnecessary resampling: Create or scan images at the desired resolution to avoid quality loss.
- Test different methods: Compare the results of different interpolation methods to choose the most suitable for each image.
- Resample copies: Resample a copy of your image to preview the effects on screen or print proofs at different resolutions.
- Set the default method: Choose a default interpolation method in Photoshop Preferences to be used for all resampling.
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