Real estate professional who market homes on the Internet should ideally have photos of the property taken and prepared for the Internet by a professional. That’s because there’s so much to know about the staging, lighting, and composition required to make a home look appealing in a photograph. There’s also a lot to know about digital images and how to prepare them for the Web.
For example, there are many possible file formats for digital images. Do you know the difference?
The best file format for an image depends on how the image will be used. Images that will be printed in a prospectus or other publication require a high resolution—200-300 pixels per inch (ppi). But images viewed over the Internet look just fine with a lower resolution (e.g., 72 ppi). In addition, the file size on Internet images needs to be low so the picture can download quickly when someone clicks on the page.
Here’s a primer on the four file formats you need to know about.
- GIF works best if the image contains a limited number of colors—if it’s, say, a floorplan or a logo with just 2 or 3 solid blocks of color. GIF images are compressed to make them smaller for the Internet, but the compression used in GIFs limits the available colors.
- JPEG is better for photographs and other images that contain many colors. The compression used to create a JPEG removes some of the pixels in the image, thereby allowing it to load quickly on the Internet, but retains the large number of colors.
- PNG is probably the best format for photographs on the Web because it compresses images efficiently like a GIF, but it shows a wide range of colors like a JPEG. But because it’s a newer file format some browsers, particularly older ones, can’t show PNG images. Therefore, it’s not yet widely used.
- TIFF files are sometimes not compressed at all, which means they can be quite large. However, they provide the best quality image. They also contain the digital information designers need to be able to expand or shrink them without distortion or loss of detail. If the image is being used to prepare a print publication, it should be created as a TIFF. But TIFFs shouldn’t be used on the Internet because they’re too big, they download too slowly, and because many browsers can’t show them at all.





