What is a fallback image?

BannerFlow's fallback images are images, a JPG, GIF or PNG that will be displayed if the device, software or browser that the banner is displayed on doesn't support HTML5, it does in other words fall back on an image instead but they can also be used as a banner of their own.

Image types

GIF

Fallback image with multiple frames

👍  Pros:

  • Multiple parts of the banner's duration can be included through frames
  • Makes it easier to get your message out
  • Does not have to be a static image


 👎  Cons:

  • Can only contain up to 256 colors which may impact the overall color quality
  • Is in most cases larger in file size compared to JPG and PNG


 Should be used when:

  • You want to have multiple parts of your banner included in a frame-by-frame animation

JPG

Fallback image


 👍  Pros:

  • Is 24-bit colors which is great for high-detail images/banners
  • The most widely used image type
  • Supports lossy compression 


 👎  Cons:

  • Does not support transparency
  • Can in some cases cause a large file-size


 Should be used when:

  • The fallback image can be a static image
  • You need a fallback image that is low in file size

PNG

Fallback image

👍  Pros:

  • Supports both 24-bit as well as 8-bit colors which is in most cases suitable for high-detail images/banners
  • Is in most cases smaller than GIF in terms of file size
  • Are preferred when low amount of colors are used
  • The compression is lossless and can be quantized


 👎  Cons:

  • Not recommended for images/banners that has a lot of detail as it can generate high file-sizes
  • Can in many cases cause larger file sizes compared to JPG


 Should be used when:

  • You need to use transparent backgrounds
  • You need a really high quality image and there is no file size requirements

When/why you could use fallback images:

  • Gives you the possibility to easily display banners in emails and in PDFs etc. without the need of creating the banner all over again in an image editing software
  • The banners will be displayed in all web browsers, even if the specific web browser doesn't support HTML5. The fallback image will automatically be shown instead
  • Banners are loaded faster on the page by displaying the fallback image whilst the HTML5 banner is being loaded, this reduces the load time and displays your banner faster. This is also known as polite loading

How to work with fallback images in BannerFlow

All fallback images are by default a one frame JPG image and generated from 2 seconds in on the banner's entire duration, although this is fully editable to be set to your own preferences in order to make the banners as optimal as possible for your market and profile. Fallback image settings are changeable through the tab "Fallback images" in the top menu.

Fallback images are built up by image frames, called fallback frame in BannerFlow. If you have more than one fallback frame specified and the Image type is set to be GIF, then a GIF animation will be made based on these frames. If on the other hand either JPG or PNG is selected, only one frame can be in use. Please note that switching from GIF to JPG or PNG will reset all fallback frame placements and place a single one at the start of the banner's timeline.

If additional frames are wanted in the GIFs then they can be added to the timeline by clicking on the Add fallback frame button found next to the Preview button just above the timeline (see image below). The fallback frame will be set to where the timeline playhead is placed, although, they can be realigned freely at any time by simply clicking and dragging them to either left or right.

It's also important to keep in mind that the Fallback frames DOES NOT take transition animations nor pulsate effects into account so the GIFs will NOT have the animations you see when previewing the HTML5 banner.

By clicking on a specific frame a small popover will appear which lets you change the frame's duration. This indicates for how long the specific frame will be displayed in the GIF, this is by default set to 2 seconds. You can also remove the frame in this popover.

When the banner is saved, the banner fallback image will be generated and updated accordingly outside of the banner builder within a few seconds.

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