Grey scales We are producers of grey step wedges and grey filtres for many optical applications. Our transmissive wedges and filtres are made on continuous tone films, with strictly controlled densities. Reflective wedges and filtres (glossy, semimatt, matt) are made either on photopaper or by screen printing. Ask us for our size, precision and spectral uniformity possibilities. Our grey wedges and filtres are used in press techniques (offset, gravure, flexography), in photography (cameras, [mini]Labs, scanners, printing), and in optical devices (light modulators in optical systems). Actual measured data: By request, wedges may come together with actual measured data: Density, Transmission/Reflection coefficients, Lightness, RGB levels, spectral curves. Certification of parameters: possible either in our laboratory, or in Czech Metrology Institute.
TRANSMISSIVE WEDGES high precision (±0,02D on each step)

TG13 13 steps, 7x10mm each. Wedge size 15x145mm. Densities: min=0,15, max=1,95, progression=0,15.


TGS21 Grey step strip 21 steps 10mm high cutting of step wedge. 21 steps, step width 7mm. Densities: min=0,05, max=3,05, progression=0,15.	TGS13 Grey step strip 13 steps 10mm high cutting of step wedge. 13 steps, step width 5mm. Densities: min=0,15, max=1,95, progression=0,15.


TG21L 21 steps, 9,5x25,4mm (3/8"x1") each. Wedge size 35x230 mm. Densities: min=0,05, max=3,05, progression=0,15.	TG21S 21 steps, 5x16mm each. Wedge size 20x166mm. Densities: min=0,05, max=3,05, progression=0,15.

TRANSMISSIVE WEDGES standard precision (±0,05D on each step)

TG3 Simple wedge for positive offset copies. 7 steps, 5x7mm each. Size:10x76mm. Densities: min=0,15, max=1,05, progression=0,15.	TKB Grey wedge on perforated 35mm film. 11 steps, 3x8mm each. Wedge size:35x57mm. Densities: min=0,15, max=1,65, progression=0,15.


TS21REPRO Grey step strip 21 steps 25mm high cutting of step wedge. 21 steps, 7x25mm each. Overall size 25x193 mm. Densities: Dmin=0,05, Dmax=3,05, progression=0,15.	TW13 13 steps, 7x10mm each. Wedge size 15x145mm. Densities: min=0,15, max=1,95, progression=0,15.


TW21S 21 steps, 5x16mm each. Wedge size 20x166mm. Densities: min=0,05, max=3,05, progression=0,15.	TW21L 21 steps, 9,5x25,4mm (3/8"x1") each. Wedge size 35x230mm. Densities: min=0,05, max=3,05, progression=0,15.


TGE4 Step wedge for setting up densitometers. 16 steps 10x14mm each. Wedge size: 30x230mm. Dmin=0,05, black desity>4,2D. Calibration data on request.	TS13 Grey step strip 13 steps 10mm high cutting of step wedge. 13 steps, 5x10mm each. Strip size 10x100 mm. Densities: Dmin=0,15, max=1,95, progression=0,15.


TS28 Grey step strip 28 steps 10mm high cutting of step wedge. 28 steps, 7x10mm each. Strip size 10x230 mm. Densities: Dmin=0,10, step1=0,15, step28=4,20, progression=0,15.	TS30 Grey step strip 30 steps 10mm high cutting of step wedge. 30 steps, 6x10mm each. Strip size 10x230 mm. Densities: Dmin=0,08, step1=0,15, step30=3,05, progression=0,10.

CUSTOM TRANSMISSIVE WEDGES AND FILTRES on sheet film

Transmissive grey strips and filtres We produce precise grey scales and filtres for special purposes in press, photo/repro/micro-graphy, digital imaging and other image reproduction processes. Maximum standard size of wedges: 240x600mm (9,5"x23"). Bigger on request. Maximum precision: ±0,01D on each step.

Samples of custom wedges


Grey step tablet - both transmissive / opaque versions 72 / 36 steps with 0,05D progression. Overall size 175x225 mm.Dmax=3,8 / 1,9, size 150x210 mm.	GREY FILTER with grid Transparent chart to test uniformity of aerial photography scans. Overall size 25x25 cm.


Grey step wedge large 28 steps 28 steps with 0,15D progresion. Step width 7mm, overall size 175x225 mm. Densities: Dmin=0,10, step1=0,15, step28=4,20, progression=0,15.	Grey step wedge large 30 steps 30 steps with 0,10D progresion. Step width 6mm, overall size 175x225 mm. Densities: Dmin=0,08, step1=0,15, step30=3,05, progression=0,10.


Grey Scale Wedge 21 steps. Wedge size 24x195 mm. Densities: min=0,05, max=3,05, progression=0,15.	TGE5 - both positive and negative 10 steps. For calibration of radiometric digitizers



REFLECTIVE WEDGES high precision (±0,02D on each step) photopaper

OG1 Low contrast precise wedge on matt photopaper. 11 steps, 7x10mm each. Wedge size 15x145mm. Densities: min=0,15, max=1,65, progression=0,15.	OG2 High contrast precise wedge on glossy photopaper. 13 steps, 7x10mm each. Wedge size 15x145mm. Densities: min=0,15, max=1,95, progression=0,15.

REFLECTIVE WEDGES standard precision (±0,05D on each step) photopaper, silk screened, inkjet print

OW11 Wedge on matt photopaper. 11 steps, 7x10mm each. Wedge size 15x145mm. Densities: min=0,15, max=1,6, progression=0,15.	OG3 Silk-screen printed, semiglossy. 19 steps, 10x25mm each. Wedge size 50x210mm. Densities: min=0,05, max=1,85, progression=0,10.


OW20S Silk-screen printed, semiglossy. 20 steps, 9,5x16mm each. Wedge size 44,5x190,5mm. Densities: min=0,05, max=1,95, progression=0,10.	ST13 Silk-screen printed, semiglossy. 20 steps, 10x22mm each. Wedge size 60x203mm. Densities: min=0,05, max=1,95, progression=0,10.