Design of user interfaces for selective editing of digital photos on touchscreen devices
Venue
Proceedings SPIE 8667 (Multimedia Content and Mobile Devices), SPIE (2013)
Publication Year
2013
Authors
Thomas Binder, Meikel Steiding, Manuel Wille, Nils Kokemohr
BibTeX
Abstract
When editing images it is often desirable to apply a filter with a spatially
varying strength. With the usual selection tools like gradient, lasso, brush, or
quick selection tools, creating masks containing such spatially varying strength
values is time-consuming and cumbersome. We present an interactive filtering
approach which allows to process photos selectively without the intermediate step
of creating a mask containing strength values. In using this approach, the user
only needs to place reference points (called control points) on the image and to
adjust the spatial influence and filter strength for each control point. The filter
is then applied selectively to the image, with strength values interpolated for
each pixel between control points. The interpolation is based on a mixture of
distances in space, luminance, and color; it is therefore a low-level operation.
Since the main goal of the approach is to make selective image editing intuitive,
easy, and playful, emphasis is put on the user interface: We describe the process
of developing an existing mouse-driven user interface into a touch-driven one. Many
question needed to be answered anew, such as how to present a slider widget on a
touchscreen. Several variants are discussed and compared.
