April 2024: Understanding Image Size and Resolution

  • Image size: Refers to the dimensions of an image, measured in pixels (width x height).
  • Image resolution: Refers to the number of pixels per inch (PPI) of an image.

Image Formats

  • JPEG: A popular image format for photographs and other images with continuous tones. It uses a lossy compression algorithm, which means that some image quality is lost when the image is saved.
  • PNG: A lossless image format that supports transparency. It is a good choice for images with sharp edges, text, or logos.
  • GIF: An animated image format that supports transparency. It is a good choice for simple animations or images with a limited number of colors.

Resizing Images

  • Use a dedicated image editing software: There are many image editing software programs available, both free and paid. Some popular options include Adobe Photoshop, GIMP, and Paint.NET.
  • Resize proportionally: When resizing an image, it is important to maintain the aspect ratio. This will prevent the image from being distorted.
  • Use the “save for web” option: Many image editing programs have a “save for web” option that allows you to optimize the image for web use. This option will typically allow you to choose the image format, quality, and size.

Optimizing Images for Web Use

  • Reduce image file size: The smaller the image file size, the faster it will load on a web page. There are a number of ways to reduce image file size, including:
    • Compressing the image: This can be done using a variety of image compression techniques, such as JPEG compression.
    • Cropping the image: This will remove unwanted parts of the image and reduce the file size.
    • Resizing the image: This will reduce the number of pixels in the image and reduce the file size.
  • Use a web-friendly image format: JPEG is the most widely used image format on the web. However, PNG is a good choice for images with sharp edges, text, or logos.
  • Use a CSS sprite: A CSS sprite is a single image file that contains multiple images. This can be used to reduce the number of HTTP requests that need to be made to load a web page.

Additional Tips

  • Use a consistent image style: This will help to create a professional and cohesive look for your website or report.
  • Use high-quality images: Low-quality images will look blurry and unprofessional.
  • Use descriptive image file names: This will help search engines to index your images.
  • Use alt text: Alt text is a text description of an image that is used by screen readers. It is important to include alt text for all images.

Here are some additional resources that you may find helpful:

Here are some additional tips for resizing and optimizing images for specific purposes:

  • Images for social media: Images for social media should be square or vertical in orientation. They should also be high-quality and visually appealing.
  • Images for email marketing: Images for email marketing should be small in file size so that they load quickly. They should also be relevant to the content of the email.
  • Images for print: Images for print should be high-resolution and saved in a print-friendly format, such as TIFF or EPS.

Compiled by:
Letowon Saitoti Abdi, Snr. Technical Support Officer, WOUGNET

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