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Imatest Documentation rummaging through the aisles of Home Depot. They consist of Irwin Quick-Grip Mini or Micro bar clamps mounted on Manfrotto quick release plates. The images below give a good idea of how they're constructed. A hole had to be drilled in the larger clamp (above) and enlarged in the lower clamp (below) to accommodate the 1/4 inch bolt. Clamp parts (top to bottom) Larger (Mini) clamp (above) 1.5" long 1/4" bolt 1/4" coupling nut Irwin Quick Grip Mini bar clamp 1/4" coupling nut "T"-brace Quick release plate The larger clamp (the Mini) is sturdier, and has proven to be more useful. Putting it together Smaller (Micro) clamp (below) 3/4" long 1/4" bolt 1/4" washer Irwin Quick Grip Micro bar clamp large 1/4" washer 1/4" coupling nut "T"-brace Quick release plate The image below summarizes how the lights should be positioned. The goal is even, glare-free illumination. The lamps represent the stacks of three SoLux track lamps, described above. This may involve a tradeoff, especially with wide-angle lenses. Lighting angles between 35 and 45 degrees work well for normal and long lenses. Avoid lighting behind the camera, which can cause glare. Ambient light should be kept subdued. Check carefully for glare and lighting uniformity before you expose, especially with wide angle lenses, where glare can be difficult to avoid: you may have to move the lights further than normal from the target— or allow glare in portions of the target, taking care that it doesn't affect critical areas. Use the meter to check for the evenness of lighting. ±20% over the entire target is sufficient for SFR and Distortion measurements, where small portions of the target are analyzed and exposure is not critical. ±5% or better should be the goal for tonal and color measurements (Stepchart, Colorcheck, and Multicharts). This should be easy to achieve because illumination only needs to be even on the relatively small charts themselves, not on the entire target. The widest (the Kodak Q-14) is 14 inches (35 cm) wide; most are under 11 inches (28 cm). Lighting uniformity is strongly affected by the distance and orientation of the lamps. Our lamps are roughly 50 inches (125 cm) from the center of the target. 106 of 451
Imatest Documentation Targets Charts are mounted on 40x60 inch (100x150 cm) or 30x40 inch (75x100 cm) 1/2 inch (1.25 cm) thick foam board, which is lightweight, rigid (unlikely to warp), and easy to find at art supply shops. The images below show entire targets. Framing would normally be tighter for test images (much tighter for the Q-14, ColorChecker, and OECF targets). In some cases, the charts are mounted on neutral, middle gray (~18% reflectance) mat board, which is attached to foam board, to ensure correct exposure in cameraphones and webcams with autoexposure. Charts are mounted using permanent double-sided tape or spray adhesive, available from hardware and art supply stores. We have used 3M 45 and 3M Photo Mount sprays, both of which are "Photo safe." 3M Super 77 is not labeled "Photo safe," (and can't be sold in California), but it should be OK for attaching gray mat board to foam board. Sharpness targets The SFRplus chart, introduced with Imatest 3.2, features automated region detection for sharpness and other measurements. It offers numerous advantages over the well-known ISO 12233 chart, particularly more accurate measurements due to reduced contrast, sufficient regions to produce a good lens response map, and compatibility with automatic region detection. SFRplus also measures distortion, tonal response, gamma (contrast), and color accuracy (with the optional color chart shown below). It is especially useful for automated testing. SFRplus charts are available for purchase. SFRplus color chart Two additional sharpness targets are also used in the Imatest lab, though less frequently than the SFRplus chart. Both consist of several charts printed on Epson Enhanced Matte (Ultra Premium Presentation - Matte) paper, which resolves detail as well as semigloss and glossy inkjet papers, but is much less susceptible to glare. These charts support SFR as well as several Rescharts modules (SFR, Log F-Contrast, Log Frequency, and Star Chart). 107 of 451
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