Effect of image size on the color appearance of image reproductions using colorimetrically calibrated LCD and DLP displays

Abstract

Abstract— Archiving images of cultural heritage based on spectral imaging techniques is an active research area in imaging science. Original and reproduced art are usually viewed under quite different viewing conditions. One of the interesting differences in viewing condition is size difference. This leads to different surrounds and adaptation states. In order to investigate the effect of size in color perception of rendered images, a visual experiment was conducted using a colorimetrically characterized digital projector and LCD. An image was rendered and projected on the screen. The same image was processed using various algorithms followed by rendering for the LCD. These LCD rendered images, by definition, were considerably smaller than the projected image. Using a paired‐comparison method, the effect of image size was investigated using a colorimetric image of Georges Seurat's, “Sunday Afternoon on the Island of La Grande Jatte — 1884.” The image rendered for an LCD with a linear increase in lightness resulted in a closer match to the image projected on screen than an original colorimetrically rendered image and was perceived as a more accurate reproduction than the majority of algorithms tested.

Identification of image attributes that are most affected with changes in displayed image size

“…Images are increasingly displayed and viewed in various sizes, under various viewing conditions. The subjective impressions of image quality will thus be affected by changes in image size [6], scene content (or complexity) [1] and also by environmental conditions, such as background colours and the intensity and colour of surrounds [7,8]. Nevertheless, traditionally display characterisation techniques do not account for the displayed image size, or scene content.…”

“…In recent years there has been several studies investigating the effect of displayed image size on colour appearance and/or image quality [7,8,9]. In colour appearance investigations by Choi et al, the studies were mainly focused on changes of the size of uniform patches, as well as illumination level, surround and relative display luminance.…”

Color correction for tone mapping

“…Color appearance studies have revealed many factors that influence our color perception. The apparent colorfulness of uniform color patches has been found to vary with the luminance (Hunt effect) [Hun52], image size [NB06] and the color of the surround [BM97]. The apparent lightness or brightness of heterochromatic patches depends on chromacity (Helmholtz&Kohlrausch effect) [Nay97] and apparent hue depends on luminance (Abney effect) [ANK87].…”

Just noticeable differences in perceived image contrast with changes in displayed image size

“…Changes in image size, or the viewing distance have been reported to lead to changes in various aspects of image appearance [2][3][4][5][6][7] .A study concerning the identification of image attributes that are most affected by changes in the displayed image size was previously carried out by the authors 7 . It considered various image attributes, including both spatial and color aspects and identified sharpness and contrast to be the two most affected attributes by changes in the displayed image size.…”