Test Chart Substrate and Sizing Guide

March 13, 2017
March 16, 2017

This guide is intended to enumerate the various possibilities and constraints of our various printed materials, and give a rough idea of the resolution of each material.

Inkjet

Inkjet is the lowest resolution process we have available, but also the cheapest and most versatile. The minimum print size with inkjet is approximately 8” x 10”, and the maximum print size for a single sheet is 44” x 80”.

We have three different substrates available for inkjet prints. We can use Matte or Semigloss paper, both of which are reflective. We also have the option of using DisplayTrans, which is a transmissive media intended for use with a backlight. All inkjet options are roughly the same resolution.

Inkjet is best suited to cameras tested at a moderate distance in order to compensate for the low quality of the print. It also works for low-resolution or wide-angle systems where chart quality is less important. As the resolution is relatively low, the size of the chart needs to be much larger to accommodate a sensor of higher resolution.

We can produce custom charts and custom sizes of any of the charts we offer. Simply email charts@imatest.com with the requested sizing and information about your lens (Field of View, and testing distance) and sensor (pixel count and aspect ratio.) We need the pixel count to be certain that the size you are requesting will be adequate for your imaging system. If needed you can use our Chart Finder Tool to determine the size of your imaging plane at a specific testing distance.

We also have available the option to tile together multiple pieces of paper to create even larger charts for extremely wide angle imaging systems.  The constraints of the multi-sheet process are the number of columns that can print on each sheet, and the chart must be assembled on site by the customer due to the extremely large sizes. We have currently produced charts as large as 80” x 120” using this process. 

Photographic Paper (Silver Halide)

Photographic media offers high-resolution reflective prints for when using a transmissive target is not an option. These prints are over twice the resolution of inkjet media.

The minimum size of a photographic print is approximately 8” x 10” and the maximum size is approximately 40” x 50”.

We can do customized sizes on this media, however there is a substantial engineering fee ($3000) for the work required to customize these targets. We offer 3 standard sizes: 1x, 2x, and 4x. Soon we wil offer a small multi-size option which has 5 different sizes on an 8” x 10” print. This multi-size is best suited for those testing low-resolution systems at close distances. Contact charts@imatest.com if you are interested.

Transmissive Photographic Film

Our film is printed using high-precision LVT Technology. We have two different types of film available. Black and White and Color. These targets are transmissive and require a lightbox in order to be used properly. 

Black and White

The Black and White film is over twice the resolution of our inkjet targets, and can optionally include a color patch for customers needing to do color measurements. The size of the film is 12” x 20” or 16” x 20” (with ½” on each side as unprintable area). The minimum target size on this media is roughly 2” x 3”. We can print multiple targets on a single sheet of film depending on the size and resolution requirements to help make this option more cost-effective.

This media is suited for customers testing in a small area with low to medium resolution cameras.

For high-resolution systems, we can tile together multiple pieces of LVT film to fit the size of your lightbox. The maximum dimensions using this option would be approximately 19” x 32”. This option is best suited for customers testing high-resolution cameras such as DSLR’s. 

Color

Our High-Precision Color film is printed on 8” x 10” film with a maximum printed area of 9.25” x 7.75”. The minimum target size on this media is approximately 0.5” x 1”. As with the Black and White film, we can print multiple targets to a single sheet of film to make this a more cost-effective option.

This media is suited for customers requiring a very compact testing system or those using conversion optics to simulate infinity within a very small space. The fine detail of the film allows us to test mid to high-resolution cameras at close distances and with a small field of view. Color film also has the highest dynamic range of all of the targets we offer. 

Chrome on Glass Photomask 

Chrome Photomasks are by far the absolute sharpest option we have available for resolution testing, though it is also our most expensive option. We use a lithographic photomasking process to print chrome directly onto glass. This process is single tone, so there is no gray-scale or tonal variance.

Chrome on Glass offers superior resolution at the cost of color and tonal measurements. Using chrome on glass, we can make targets as small as 2mm x 3mm for measuring devices such as endoscopes or microscopy equipment. When printing to glass, the chrome has an optical density of 1, which gives a contrast ratio of approximately 10:1, suitable for resolution measurement.

Our standard glass plates are 4” x 4” with a non-printable border of 1 cm. At maximum size on our 4” glass plates, we can measure imaging systems with a resolution above 25 Megapixels.

We can source plates up to 20” x 20” and as small as 1” x 1”. Any plates larger than 4” x 4” will require an extended lead time of 6-8 weeks. A 20” plate with our SFRplus pattern would be suitable for testing cameras over 100MP.

We can customize the size of various targets such as our own SFRplus or ISO-eSFR targets on request. We can also print most custom design requests to glass, though some may require an engineering fee depending on the complexity of the design.  Contact charts@imatest.com.

 

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