Thermal imaging cameras capture infrared radiation emitted by physical surfaces, mapping heat variations to visible false-color palettes such as Ironbow, Rainbow, or grayscale. Electrical engineers, HVAC technicians, and building inspectors use thermal captures to locate resistive junction overheating, circuit board hotspots, motor bearing friction, and exterior building envelope insulation leaks.

### Radiometric Inspection Mechanics This interactive tool allows point-and-click surface temperature sampling directly from thermal captures: - **Image Upload & Canvas Rendering:** Loads standard thermal JPEG or PNG images onto an HTML5 canvas without downscaling. - **Temperature Scale Calibration:** Define the low and high thermal boundaries representing the thermal camera's calibrated range (default: 20°C ambient to 110°C maximum hotspot). - **Palette Sensitivity:** Supports Ironbow and Rainbow false-color gradients to align with standard thermography conventions. - **Spot Temperature Sampling:** Clicking any coordinate on the thermal image samples the pixel's RGB color values, measures relative position along the calibrated color gradient, and reports estimated surface temperature in degrees Celsius (°C).

### Worked Inspection Scenario Suppose you inspect a thermal photograph of a high-power DC-DC converter circuit board: 1. Upload your thermal capture using the file selector. 2. Set Minimum Temperature to 20°C and Maximum Temperature to 110°C based on your camera’s display scale. 3. Select the **Ironbow** palette setting. 4. Click directly on a glowing bright white power MOSFET transistor on the canvas. 5. The inspector reads the peak color values and outputs an estimated spot temperature of 102°C, flagging an active component hotspot for heatsink redesign.

### Local Image Privacy All pixel luminance calculations, color gradient interpolation, and canvas rendering execute entirely within your client web browser. Proprietary facility thermal audits, circuit board schematics, and infrared photographs are never uploaded to any remote server.