Design Specifications

physical form factor orientation the intended orientation of the target is with the qr code in the top right and the serial number text right reading and below the qr code depending on the software being used in conjunction with the target, placing the target at other orientations may or may not be supported dimensions the target is meant to have a size similar (but not identical) to a 4x5 inch piece of photographic film, and to fit into carriers designed to hold 4x5 film such as the dt film scanning kit 4x5"as viewed from above (the typical vantage point of a camera capturing the target for profiling or color measurement) the targets exterior measures 5 16x4 16 inches (131 1x106 7 mm) also available is an engineering docid\ q33aox8q6xxuoldrszvpt of other dimensions materials the target is comprised of two layers metal top layer or rigidity and durability abs bottom layer to reduce the chance of scratching a surface it is placed on, such as a glass carrier thickness / plane of focus the bottom abs layer is 0 065" (1 6mm) thick the metal layer extends out past the edge of the abs layer forming a "lip" (measuring 0 188" or 4 8mm) around the edge of the target if the target sits into a framed carrier (such as the dt film scanning kit 4x5" magnetic carrier) then the patches and the color qr code will be at the plane of focus if the target rests on top of a surface such as a glass carrier the color patches and the qr code will be slightly higher than the plane of focus measurement serial number specific measurements every dt ntpt and dt ntvt target is individually measured by a professional metrologist (dr dave wyble) using a nist traceable lab grade spectroradiometer generally these measurements are more relevant (made in situ in camera taking geometry), more precise (higher quality hardware), and more accurate (nist traceable calibration; each measurement made three times with replacement) than what is possible for most end users to achieve with a consumer grade spectrophotometer such as the i1 however, the design of the target purposefully made large circular patches that were isolated from their neighboring patches by black masking specifically to facilitate measurement with a variety of devices we encourage you to make your own measurements and reach out with any questions or observations you may have; we love discussing target measurement! qr code the measurements specific to each target are provided via the docid\ chkwooxvm5rosnvrnevrx in the form of the qr code in the top corner of that target patch design texture in each target the patches carry a distinct diagonal texture this texture provides microcontrast that can be used to implement focus/detail evaluation, for example to assist with automatic focusing (at the focus plane rather than on the edges of the top metal layer) and planarity (parallel ness) evaluation for example if the texture is more prominent in the patches on the left half of the target, that implies the target and camera are not perfectly parallel – not a problem for the use of the target for making or evaluating color profiles, but a problem for the user of the system for scanning film or glass plates note that the absolute tonal variation of this texture is around +/ 1 rgb value, and the calibration software should take an average value which will correspond to the averaged spectroradiometer measurement included for each target; that is, the texture does not negatively affect the calibration or evaluation use of this target shape while the shape of each patch is roughly circular the shape comes from the cut opening of a black mask which will have minor imperfections we suggest using shape finding or manual placement rather than feature matching, as the exact imperfections in the patch circle shape will vary from patch to patch and target to target opaque patch on the dt nexus transmissive profiling target the "patch" at a9 is completely opaque the mask in that row/column is uncut so no circle is visible at any level of illumination this is different than the other very dark patches (e g m9 on the dt ntvt and a8 on the dt ntpt) which are dark enough that they may not be distinctly visible depending on the profile, monitor, and user, but are most assuredly not opaque and should have a measurable non zero tone on well calibrated high quality scanners qr code density the qr code used for the openqualia label in the top right of the target is printed on photographic e6 film and carries a moderate density so will show up as light gray this is a purposeful choice to avoid this patch causing flare lack of white there is no patch in either target that is fully transparent this is a conscious choice to avoid causing intra frame flare the exact aim point for the white patches are defined in the serial number specific measurement file for easy reference an approximate value is below dtntpt patch a1, with l of 83 dtntvt patch h9, with l of 80 exact white point aims can be found at the openqualia website for https //nexus digitaltransitions com/api/v1/targets/dt/ntpt and https //nexus digitaltransitions com/api/v1/targets/dt/ntvt