The 6 key factors to consider when optimizing images for the web are:
- Always start with picture dimensions (w, h) greater than your target size
- Set the image resolution between 72 and 96 pixels/inch
- Crop the image to only keep the area needed to convey your message
- Resize the cropped image to reduce the dimensions to the minimum while maintaining the proportion between width and height
- Choose the appropriate export file format: PNG, JPEG or GIF
- Select the right compression ratio/color range
