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Imatest Documentation The Imatest Test Lab How to build a testing lab The Imatest Laboratory was set up for several purposes. To demonstrate how to construct a cost-effective image quality testing lab. To validate new Imatest modules and image quality testing concepts. To perform tests for clients who need low volumes of testing or want to verify their own testing methods. To photograph artwork. The optimum setup for measuring image quality is, not coincidentally, optimum for photographing fine art. The lab was designed to meet the following goals. Low cost, easily obtainable, high quality components. Portable: easy to move if needed. Hardware Substitutions can be made for most of the parts listed below. Creativity is encouraged in assembling a lab. Lighting To obtain high quality illumination covering up to 40x60 inch (100x150 cm) foam board with reasonably good uniformity and smaller areas with high uniformity, we selected a track lighting system that takes the outstanding SoLux 4700K (near daylight) 12V MR16 halogen lamps, which use long-lasting built-in dichroic filters. Fixture. The Hampton Bay K15 expandable halogen track lighting kit (724-491), available from Home Depot, along with the A18 end connector with cord and switch (678 546) is inexpensive and excellent. It's not on their website. Similar products should work equally well, for example, the Pro Track 150 Watt Low Voltage Track Kit (65227) from Lamps Plus. Lamps. We use 6 SoLux 50W 4700K/36 degree MR16 bulbs, along with 6 Plano Convex diffusers, which are necessary for even light. The diffusers are mounted in front of the lamps (rightmost image), in place of the clear glass supplied with the track lighting kit. "T" braces with self-adhesive felt pads were added to the sides of the lamp fixtures to block stray light from reaching the lens (rightmost image). SoLux halogen bulbs are inexpensive and produce extremely high quality near-daylight 4700K illumination, with a CRI (Color Rendering Index) of 98 out of 100. They were featured in a recent article in Inkjetart.com. SoLux also sells track lighting components. Lights & stand Lamp detail Stand. The Radio Shack 33-335 folding microphone stand is simple, lightweight, sturdy, and cheap. Assembly. The track is attached to the stand with an 8-32 bolt. Here is the procedure. 68 of 451
Imatest Documentation Drill holes large enough for an 8-32 bolt about 1.25 inches (3.5 cm) below the top of the upper shaft of the microphone stand and about 10 inches (25cm) below the top of the track (the end without the cord). The head of a 1.25 or 1.5 inch 8-32 bolt is placed inside the track, then attached with two nuts on the back of the track to provide a little spacing with the stand. A wing nut (optional) is used to secure the bolt to the stand. [Parts sequence: 8-32 bolt (head), track, 2 8-32 nuts, upper shaft of microphone stand, 8-32 wing nut.] (CAUTION: do not do this unless you know how to work with electrical wiring safely. DO NOT do this when the track is plugged in! ) The remainder of the track is attached to the stand by a combination of materials that allow the stand to be raised and lowered. Cambuckles and nylon webbing. Nice because they put tension on the webbing when they are closed. 1 inch and 2 inch Available from REI. Strapall heavy-duty Quick Tape, available from REI and many other sources. This is a strong double-sided Velcro tape. Sticky-back Velcro tape. Can attach to both the mic stand and the back of the track, but contact area is limited. The lights are mounted near the top, middle, and bottom of the 40 inch high targets. If you have a large budget and need high intensity illumination, check out the Imaging Resource laboratory-grade lighting system, which uses HMI lamps. Easel The Mabef M-10 easel was chosen because it was sturdy, could be adjusted vertically (checked with a small level), had just the right features, and was on display at a local art supply store. A self-adhesive felt pad on the bottom of the upper clamp helps secure targets. Light measurement The BK Precision 615 Light meter (Lux meter) is an outstanding low-cost instrument (about $100 USD) for measuring incident light (illuminance). It has a flat diffuser and photopic response (similar to the human eye in bright light). It is particularly useful for measuring evenness of illumination. We purchased ours from Action Electronics, which offers several alternative choices. The BK was chosen over similar Easyview meters because it has a flat (rather than hemispheric) diffuser that better represents the geometry of the flat targets. Readings can be somewhat slow, with settling times around 3-5 seconds. Miscellaneous Several additional items can come in handy: a small level, a flashlight (LED models are cool), rulers, a few clamps, etc. A bubble level mounted on a camera's accessory shoe can be particularly helpful. A few Irwin Quick-Grip Handi-Clamps are useful for attaching the targets to the easel. 69 of 451
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