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.


   

OW20L     

Silk-screen printed, semiglossy. 

20 steps, 17,5x25,4mm each. 

Wedge size 70x356mm. 

Densities: min=0,05, max=1,95, progression=0,10.


ST14     

Silk-screen printed, semiglossy. 

20 steps, 17,5x31mm each. 

Wedge size 76x356mm. 

Densities: min=0,05, max=1,95, progression=0,10.