formal systems

• Image Size and Quality

Selecting the quality of export images has been simplified in versions 2.4 and later of the GalleryLR plugin, and versions 1.2 and later of the GLRFile plugin.

Image Size

It is recommended that exported images are resized so that their longest side has 2008 pixels. This size results in good image quality for all iOS devices and is suitable for AirPlay and external monitors.

However, there are a few situations in which you may wish to change this default size:

  1. If you are using a high-definition monitor you may wish to increase the size of exported images.
  2. If you are using an iPad 2, iPad mini, iPhone or iPod Touch and you are not using AirPlay or an external monitor, you may wish to reduce the size of exported images in order to save space. The following table gives the receommended sizes for different iOS devices.
    DeviceLongest Side
    iPad 2 / iPad mini1004
    iPhone 5 / iPod Touch 5G1096
    iPhone 4 / iPod Touch 4G920
    Older Devices460

Image Quality

Depending on the aspect ratio of the cropped image in Lightroom, with the recommended settings an exported image will contatin roughly 2 to 4 MBytes of data.

For many images, lower JPEG quality makes no descernable difference. Therefore, to give users more control over the amount of storage required for their galleries,the GalleryLR plugins offer three preset quality options - Low, Medium and High.

The following table gives typical data sizes for images exported with the different options.

Image SizeJPEG QualityImages Size (KBytes)
2008High3100
2008Medium999
2008Low595
1004High977
1004Medium417
1004Low286

A JPEG Qaulity of Medium reduces image size and in most cases, gives acceptable image quality.