Digital Photo Calculator (DpCalc) is a tool for digital photography related calculations on iPhone and iPod Touch.

Sensor

Sensor calculator allows calculating pixel dimensions, pixel density, pixel size, estimated resolution and estimated diffraction limit of a sensor.

Inputs

Select size and type of sensor on the picker wheel, optionally turn off compensation for the anti-aliasing filter.

Results

Touching the Show button displays the results:

• Approximate pixel dimensions of the sensor
• Pixel density
• Pixel size
• Estimated resolution
• Diffraction limit

Details

Pixel dimension of the sensor is calculated from physical dimensions and size in megapixels. Since this information is only approximate, the calculated pixel dimension may not be accurate to the last digit.

Color

Lab to RGB

Converts Lab values to three most popular RGB spaces.

Inputs

Enter values in Lab.

Results

• Values in sRGB, AdobeRGB and ProPhoto RGB
• Visual representation of the color
• Color temperature, if available
• Colorimetric density

Details

RGB values are displayed in range 0..255. Color values that are out of gamut of the target color space are clipped and displayed as 0 or 255.

RGB to Lab

Converts RGB values from most popular RGB spaces to Lab.

Inputs

Enter values in RGB (0..255) and select which color space these values represent.

Results

• Values in Lab
• Visual representation of the color
• Color temperature, if available
• Colorimetric density

RGB to RGB

Converts RGB vales between three most popular color spaces.

Inputs

Enter values in RGB (0..255) and select which color space these values represent.

Results

• Values in sRGB, AdobeRGB and ProPhoto RGB
• Color value displayed as web color (#RRGGBB)
• Visual representation of the color
• Color temperature, if available
• Colorimetric density

Details

The web color is always represented as sRGB.

Lens and focus

Hyperfocal distance and depth of field

These two closely related calculators provide hyperfocal distance and depth of field of a given lens.

A – Hyperfocal distance

Inputs

Select resolution of used sensor in megapixels, its type (size) and focal length of used lens.

Results

• Hyperfocal distance
• Closest distance still in focus
• F-stop to use to reach this depth of field

Touch inside of the table to switch between feet and meters.

Details

Hyperfocal tables and calculators need to establish what is “sufficient sharpness”. To ensure adequate detail for landscape photography, this calculator estimates sufficient sharpness from parameters of the sensor and diffraction limit. This means that the smallest recognizable detail is the smallest detail given camera sensor can record and the calculated f-stop is the highest number not yet impacted by diffraction. The calculator also allows using more traditional calculation where the sufficient sharpness is derived from so called Zeiss formula. If you prefer this less rigorous calculation, scroll to the top to select asterisk (*) instead of number on the megapixels selector. Even though the hyperfocal distance and depth of field calculators are trying to calculate the results as precisely as possible, these calculations are theoretical and, for example, do not account for different lens designs. Please use it only as a starting point for your photography.

B – Depth of field

Depth of field calculator is available from Hyperfocal distance.

Inputs

Depth of field calculator uses data entered in the Hyperfocal distance view. In addition, f-stop and distance information needs to be provided. Move sliders f and d to select desired f-stop (slider f) and distance (slider d).

Results

• Near edge of sufficient sharpness
• Far edge of sufficient sharpness
• Dept of field
• Selected f-stop
• Selected distance

Touch inside of the table to switch between feet and meters.

Details

Depth of field calculations are based on selections made in the Hyperfocal distance view. Please see Hyperfocal distance above for more information.

Crop factor

Crop factor provides information about the sensor size relative to full frame or 24x36mm and information about angle of view.

Inputs

Select focal length of the lens and type of sensor.

Results

• Crop factor relative to full frame camera (24x36mm)
• Focal length relative to full frame
• Angles of view (width, height and diagonal)