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Painting in High Dynamic Range

机译：高动态范围绘画

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摘要

We present a novel approach that allows users to intuitively and interactively manipulate High Dynamic Range (HDR) images using commonly available Low Dynamic Range (LDR) displays. This solves the problem of how to draw with contrasts that are much larger than the monitor can display. Whereas commercial HDR-enabled drawing programs manipulate tone mapped representations of HDR images, we provide an intuitive brush interface that supports interaction with the unmapped HDR imagery. Our approach introduces two new brush constructs to a typical virtual painting interface, such as Adobe Photoshop. First, we present a brush that locally adjusts the display of the HDR image to a dynamic range specified within a real-time, interactive, local histogram of the region around the cursor. This affords precise, quantitative control of the HDR contrast values produced by the brush. Second, we demonstrate a brush that uses the perception of glare as the underlying basis for determining the contrasts painted onto the HDR image, giving artistic control over the HDR contrasts. By maintaining an HDR image, the result is available for further manipulation and processing by algorithms, such as those used in image-based rendering, for which an LDR representation is inadequate. Finally, we use the Graphics Processing Unit to provide real-time visual feedback for the effects of each image manipulation.
机译：我们提出了一种新颖的方法，该方法允许用户使用常见的低动态范围（LDR）显示器直观地和交互式地操作高动态范围（HDR）图像。这解决了如何以比监视器可以显示的对比度大的对比度进行绘制的问题。启用商业HDR的绘图程序可操纵HDR图像的色调映射表示，而我们提供了直观的画笔界面，支持与未映射的HDR图像的交互。我们的方法向典型的虚拟绘画界面（如Adobe Photoshop）引入了两种新的画笔构造。首先，我们提供一个画笔，该画笔可将HDR图像的显示局部调整到动态范围内，该范围在光标周围区域的实时，交互式，局部直方图中指定。这样就可以精确，定量地控制画笔产生的HDR对比度值。其次，我们演示了一种刷子，该刷子使用眩光感作为确定涂在HDR图像上的对比度的基础，从而可以对HDR对比度进行艺术控制。通过维护HDR图像，结果可用于通过算法（例如在基于图像的渲染中使用的算法）进行进一步的操作和处理，而对于LDR表示而言，这些算法是不合适的。最后，我们使用图形处理单元为每个图像处理的效果提供实时的视觉反馈。

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