Bottle-cap colour appearance: reduce lighting variation before comparing the surface
The source colour capture shows a yellow cap-like face with a lighter region on one side. A thin flat coaxial light is the demonstrated illumination; a new trial still needs controlled exposure and colour processing before assigning a colour limit.
Control the colour recipe before turning a lighter patch into a reject decision.
Real camera capture
- Light in sourceLS-FCS50 · white
- EvidenceReal application-lab image
- Imaging kitCamera, lens and fixture proposed
- AcceptanceValidate on representative parts
Lighting application-lab catalog capture
What the camera saw
Cropped from the source test sheet; original test annotations are retained. Captures are not generated or enhanced. Drag a comparison slider, or open any image full size.
The challenge
Apparent colour changes with highlights, exposure and white balance as well as the material itself.
Curved geometry can create local illumination changes that resemble a material difference.
How it was solved
The source identifies the white flat coaxial light for bottle-cap colour-difference inspection. It does not supply calibrated colour values or classify the light patch.
Use a proposed colour camera and the narrower macro field for a representative cap sample. Keep the illustrated viewing field within the 50 mm light-guide region and confirm glare on the real part.
Why it works
- 1
The thin light-guide arrangement provides a source path to try when uniform reflected appearance matters and mounting space is limited.
- 2
A visible lighter region is not a quantified colour difference or proof of a material defect.
Lighting application-lab catalog capture
Evidence you can inspect
A lighter region is visible against the yellow circular face.
The source labels the image bottle-cap surface colour-difference inspection with the white LS-FCS50.
One uncalibrated colour image, without a numerical colour difference, accepted/rejected sample labels or lighting/camera repeatability data.
From image contrast to a production decision
What to validate on your part
- 01
Stabilize the camera recipe
Fix exposure, white balance and colour processing, and use a suitable reference if numerical colour acceptance is required.
- 02
Include normal surface variation
Test curvature, mould finish, permitted gloss and accepted colour batches.
- 03
Validate the acceptance limit
Compare labelled surface differences under repeatable geometry and record false calls.
From the demo to your test bench
Parts in this setup
LightTested
LS-FCS50
50 x 50 mm Flat coaxial light (LS-FCS50)
White LS-FCS50 named in the bottle-cap colour-difference example. Printed 50 × 50 mm luminous area and 90 × 90 × 10 mm housing. This flat light-guide construction is not an opaque backlight or a block beamsplitter.
$129.00
In proposed setup
CameraOur pick
MV-CS050-10GC
Hikrobot MV-CS050-10GC 5MP Area Scan Camera, GigE, IMX264, Color, Basic
5 MP colour global-shutter camera proposed to retain colour information. Confirm colour processing and sampling on the actual application.
$739.00
In proposed setup
LensOur pick
LS-KF3528M-ML
35mm, F2.8, 1.1", C-mount, Macro lens (59 mm (-0.7X) to 150 mm (-0.25X)) (LS-KF3528M-ML)
Proposed 35 mm C-mount macro lens at its printed 0.25x magnification / 150 mm working-distance pair. The proposed 2448 × 2048 sensor with 3.45 µm pixels gives a derived 33.7824 × 28.2624 mm field; confirm focus, coverage and residual distortion on the real sample.
$339.00
In proposed setup
Camera test stationOur pick
LS-BT-XZ-G-6-6045
Camera stand with XZ adjustment and glass tray, height 600 mm (LS-BT-XZ-G-6-6045)
600 mm column, 600 × 450 mm breadboard, XZ adjustment, glass tray and two lighting holders as listed. Proposed bench fixture; confirm loads, travel and camera/lens clamps.
$359.00
In proposed setup
"Tested" identifies the part named in the source. "Our pick" is a proposed alternative or supporting part. Confirm colour, optics, controllers, power supplies, cables and mounting before ordering.
The set-up
| Tested light | LS-FCS50, white |
|---|---|
| Source camera / lens | Not specified in the source image caption; proposed parts below |
| Proposed lens point | 0.25x at 150 mm, printed lens pair |
| Derived proposed field | 33.7824 × 28.2624 mm = sensor dimensions / 0.25x; not a source test field |
| Light-guide area (printed) | 50 × 50 mm |
| Housing (printed) | 90 × 90 × 10 mm |
| Optical arrangement | Camera views through the transmissive flat light-guide region; verify on the actual sample |
| Mounting (proposed) | LS-BT-XZ-G-6-6045; 600 mm column, 600 × 450 mm base, glass tray and two included lighting holders |
Mount the optics with intent
The station is an optical test bench, with its two lighting holders included in the catalog listing. The 3D column and base follow the published height and footprint. Carriages, clamps and part supports are schematic: confirm camera screw pattern, lens support, light fasteners, permissible load and actual travel before ordering.
Complete the electrical system
Select a controller against the exact light voltage, drive mode and power, then confirm camera data/power/I/O cables and a suitable PC. These are not silently added to the proposed optical kit.
Build this system
Start from this setup, adapt it to your part.
The configurator opens with this study's camera, lens, light and station picked. Swap any part, check fit and price, then buy or ask for a quote.
Camera and available lens CAD are published models. Lens and light envelopes use printed dimensions. The linked station uses its published base size and column height; carriage, brackets, fittings, parts and spacing are illustrative. Confirm load, travel, fasteners and clearances before ordering. Light paths explain the arrangement and do not simulate optical performance. Representative part geometry is illustrative, not reconstructed inspection evidence. The specimen and lighting angle are representative, not dimensions or settings recovered from the source capture.
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Make the next trial specific.
Tell us the part size, smallest defect or tolerance, available working distance, material and line speed. Include what a good part and a reject look like.
About this case study: the photos and camera images come from the application laboratory of the maker of the lighting and optics we sell, imaged on the parts shown; your results depend on your part, camera and set-up. This is an application-lab study, not a LumaSpec customer deployment. Source figures are reported results; proposed components require a fresh trial. The 3D scene illustrates the arrangement and does not simulate imaging performance.