高精度36补丁相机动态范围测试卡

该图具有36个低噪声密度片，密度梯度为大约0.1，密度最小3.2（从基底到基底的密度+3.1最小）。 接近圆形的贴片布置确保渐晕对结果具有最小的影响。 将提供具有实际密度的CSV参考文件。 该图卡在设计在203×254mm（8×10英寸）的胶片上具有197×235mm（7.75×9.25英寸）的有效面积。

图卡包含中心和角落的斜边比例为4:1用于测量MTF值。它还包含在中心和角落的倾斜边缘与4：1对比度测量MTF。边缘具有MTF50≥16周/mm，这比良好喷墨图卡好约3倍。 定位标记使得区域容易选择。中性灰色背景有助于确保图卡在自动曝光相机中曝光良好（与具有黑色背景的图卡相比，黑色背景图卡有时会过度曝光）。

它支持Stepchart，Multicharts，Multitest，如果有多个手动曝光，可以与动态范围后处理器一起使用。Dmax> = 3.4足以用于具有小像素尺寸的相机手机和数码相机，但是高端DSLR通常具有较高的动态范围（以及手动曝光），这使得它们更适合于高动态范围卡。

该图表采用高精度LVT胶片记录过程，以获得良好的密度范围，低噪声和精细细节。

Details

This chart has 36 low-noise density patches with density steps of approximately 0.1, for a density range of at least 3.2 (density from base to base + 3.1 minimum). A nearly circular patch arrangement ensures that vignetting has minimal effect on results.  A CSV reference file with actual densities will be supplied.  The chart has an active area of 197x235 mm (7.75x9.25 inches) on 203x254 mm (8x10 inch) film.

It also contains slanted edges in the center and corners with 4:1 contrast for measuring MTF. The edges have an MTF50 >= 16 cycles/mm, which is about 3 times better than the best inkjet charts. Registration marks make the regions easy to select. A neutral gray background helps ensure that the chart will be well-exposed in auto exposure cameras (compared to charts with black backgrounds, which are sometimes strongly overexposed).

It is supported by Stepchart, Multicharts, Multitest and can be used with the Dynamic Range postprocessor if several manual exposures are available. Dmax >= 3.4 is sufficient for camera phones and digital cameras with small pixel sizes, but high-end DSLRs generally have higher dynamic ranges (and also manual exposure), which makes them well suited for Dynamic Range.

This chart is produced with a high-precision LVT film recording process for the best possible density range, low noise, and fine detail. 

LVT Targets with reference files are guaranteed to remain accurate for one year from first use. After this time the targets can be returned for re-calibration and will be returned with a new reference file.