HP Photosmart 320 vs. Canon PowerShot A480

Comparison

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HP Photosmart 320

Canon PowerShot A480

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Megapixels

2.10

10.00

Max. image resolution

1632 x 1232

3648 x 2736

Sensor

Sensor type

CCD

Sensor size

1/2.7" (~ 5.33 x 4 mm)

1/2.3" (~ 6.16 x 4.62 mm)

Sensor resolution

1672 x 1257

3647 x 2742

Diagonal

6.66 mm

7.70 mm

Sensor size comparison

Sensor size is generally a good indicator of the quality of the camera. Sensors can vary greatly in size. As a general rule, the bigger the sensor, the better the image quality.

Bigger sensors are more effective because they have more surface area to capture light. An important factor when comparing digital cameras is also camera generation. Generally, newer sensors will outperform the older.

Learn more about sensor sizes »

Actual sensor size

Note: Actual size is set to screen → change »

	vs
1	:	1.33
(ratio)

HP Photosmart 320		Canon PowerShot A480

Surface area:

21.32 mm²

28.46 mm²

Difference: 7.14 mm² (33%)

A480 sensor is approx. 1.33x bigger than 320 sensor.

Note: You are comparing sensors of very different generations. There is a gap of 7 years between HP 320 (2002) and Canon A480 (2009). Seven years is a lot of time in terms of technology, meaning newer sensors are overall much more efficient than the older ones.

Pixel pitch

3.19 µm

1.69 µm

Pixel pitch tells you the distance from the center of one pixel (photosite) to the center of the next. It tells you how close the pixels are to each other.

The bigger the pixel pitch, the further apart they are and the bigger each pixel is. Bigger pixels tend to have better signal to noise ratio and greater dynamic range.

Difference: 1.5 µm (89%)

Pixel pitch of 320 is approx. 89% higher than pixel pitch of A480.

Pixel area

10.18 µm²

2.86 µm²

Pixel or photosite area affects how much light per pixel can be gathered. The larger it is the more light can be collected by a single pixel.

Larger pixels have the potential to collect more photons, resulting in greater dynamic range, while smaller pixels provide higher resolutions (more detail) for a given sensor size.

Relative pixel sizes:

Pixel area difference: 7.32 µm² (256%)

A pixel on HP 320 sensor is approx. 256% bigger than a pixel on Canon A480.

Pixel density

9.84 MP/cm²

35.05 MP/cm²

Pixel density tells you how many million pixels fit or would fit in one square cm of the sensor.

Higher pixel density means smaller pixels and lower pixel density means larger pixels.

Difference: 25.21 µm (256%)

Canon A480 has approx. 256% higher pixel density than HP 320.

To learn about the accuracy of these numbers, click here.

Specs

HP 320

Canon A480

Crop factor

6.5

5.62

Total megapixels

Effective megapixels

10.00

Optical zoom

3.3x

Digital zoom

Yes

ISO sensitivity

100

Auto, 80, 100, 200, 400, 800, 1600

RAW

Manual focus

Normal focus range

75 cm

50 cm

Macro focus range

10 cm

1 cm

Focal length (35mm equiv.)

38 mm

37 - 122 mm

Aperture priority

Max. aperture

f4.5

f3 - f5.8

Max. aperture (35mm equiv.)

f29.3

f16.9 - f32.6

Metering

Centre weighted

Centre weighted, Evaluative, Spot

Exposure compensation

±3 EV (in 1/2 EV steps)

±2 EV (in 1/3 EV steps)

Shutter priority

Min. shutter speed

1 sec

15 sec

Max. shutter speed

1/1000 sec

1/2000 sec

Built-in flash

External flash

Viewfinder

Optical (tunnel)

None

White balance presets

Screen size

1.5"

2.5"

Screen resolution

61,600 dots

115,000 dots

Video capture

Max. video resolution

Storage types

MultiMedia, Secure Digital

SDHC, Secure Digital

USB

USB 1.0

USB 2.0 (480 Mbit/sec)

HDMI

Wireless

GPS

Battery

AA (4) batteries (NiMH recommended)

2 x AA Alkaline or NiMH Batteries (Alkalines supplied)

Weight

160 g

140 g

Dimensions

113 x 44 x 69 mm

92 x 62 x 31 mm

Year

2002

2009

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Diagonal

Diagonal is calculated by the use of Pythagorean theorem:

Diagonal = √

w² + h²

where w = sensor width and h = sensor height

HP 320 diagonal

The diagonal of 320 sensor is not 1/2.7 or 0.37" (9.4 mm) as you might expect, but approximately two thirds of that value - 6.66 mm. If you want to know why, see sensor sizes.

w = 5.33 mm
h = 4.00 mm

Diagonal = √

5.33² + 4.00²

= 6.66 mm

Canon A480 diagonal

The diagonal of A480 sensor is not 1/2.3 or 0.43" (11 mm) as you might expect, but approximately two thirds of that value - 7.7 mm. If you want to know why, see sensor sizes.

w = 6.16 mm
h = 4.62 mm

Diagonal = √

6.16² + 4.62²

= 7.70 mm

Surface area

Surface area is calculated by multiplying the width and the height of a sensor.

320 sensor area

Width = 5.33 mm
Height = 4.00 mm

Surface area = 5.33 × 4.00 = 21.32 mm²

A480 sensor area

Width = 6.16 mm
Height = 4.62 mm

Surface area = 6.16 × 4.62 = 28.46 mm²

Pixel pitch

Pixel pitch is the distance from the center of one pixel to the center of the next measured in micrometers (µm). It can be calculated with the following formula:

Pixel pitch =	sensor width in mm	× 1000
	sensor resolution width in pixels

320 pixel pitch

Sensor width = 5.33 mm
Sensor resolution width = 1672 pixels

Pixel pitch =	5.33	× 1000	= 3.19 µm
	1672

A480 pixel pitch

Sensor width = 6.16 mm
Sensor resolution width = 3647 pixels

Pixel pitch =	6.16	× 1000	= 1.69 µm
	3647

Pixel area

The area of one pixel can be calculated by simply squaring the pixel pitch:

Pixel area = pixel pitch²

You could also divide sensor surface area with effective megapixels:

Pixel area =	sensor surface area in mm²
	effective megapixels

320 pixel area

Pixel pitch = 3.19 µm

Pixel area = 3.19² = 10.18 µm²

A480 pixel area

Pixel pitch = 1.69 µm

Pixel area = 1.69² = 2.86 µm²

Pixel density

Pixel density can be calculated with the following formula:

Pixel density = (	sensor resolution width in pixels	)² / 1000000
	sensor width in cm

One could also use this formula:

Pixel density =	effective megapixels × 1000000	/ 10000
	sensor surface area in mm²

320 pixel density

Sensor resolution width = 1672 pixels
Sensor width = 0.533 cm

Pixel density = (1672 / 0.533)² / 1000000 = 9.84 MP/cm²

A480 pixel density

Sensor resolution width = 3647 pixels
Sensor width = 0.616 cm

Pixel density = (3647 / 0.616)² / 1000000 = 35.05 MP/cm²

Sensor resolution

Sensor resolution is calculated from sensor size and effective megapixels. It's slightly higher than maximum (not interpolated) image resolution which is usually stated on camera specifications. Sensor resolution is used in pixel pitch, pixel area, and pixel density formula. For sake of simplicity, we're going to calculate it in 3 stages.

1. First we need to find the ratio between horizontal and vertical length by dividing the former with the latter (aspect ratio). It's usually 1.33 (4:3) or 1.5 (3:2), but not always.

2. With the ratio (r) known we can calculate the X from the formula below, where X is a vertical number of pixels:

(X × r) × X = effective megapixels × 1000000 →

X = √	effective megapixels × 1000000
	r

3. To get sensor resolution we then multiply X with the corresponding ratio:

Resolution horizontal: X × r
Resolution vertical: X

320 sensor resolution

Sensor width = 5.33 mm
Sensor height = 4.00 mm
Effective megapixels = 2.10

r = 5.33/4.00 = 1.33

X = √	2.10 × 1000000	= 1257
	1.33

Resolution horizontal: X × r = 1257 × 1.33 = 1672
Resolution vertical: X = 1257

Sensor resolution = 1672 x 1257

A480 sensor resolution

Sensor width = 6.16 mm
Sensor height = 4.62 mm
Effective megapixels = 10.00

r = 6.16/4.62 = 1.33

X = √	10.00 × 1000000	= 2742
	1.33

Resolution horizontal: X × r = 2742 × 1.33 = 3647
Resolution vertical: X = 2742

Sensor resolution = 3647 x 2742

Crop factor

Crop factor or focal length multiplier is calculated by dividing the diagonal of 35 mm film (43.27 mm) with the diagonal of the sensor.

Crop factor =	43.27 mm
	sensor diagonal in mm

320 crop factor

Sensor diagonal in mm = 6.66 mm

Crop factor =	43.27	= 6.5
	6.66

A480 crop factor

Sensor diagonal in mm = 7.70 mm

Crop factor =	43.27	= 5.62
	7.70

35 mm equivalent aperture

Equivalent aperture (in 135 film terms) is calculated by multiplying lens aperture with crop factor (a.k.a. focal length multiplier).

320 equivalent aperture

Crop factor = 6.5
Aperture = f4.5

35-mm equivalent aperture = (f4.5) × 6.5 = f29.3

A480 equivalent aperture

Crop factor = 5.62
Aperture = f3 - f5.8

35-mm equivalent aperture = (f3 - f5.8) × 5.62 = f16.9 - f32.6

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