Pixel = picture element. The building block of a digital image.

one pixel

Pixel = picture element. The building block of a digital image.More pixels will build a bigger picture.

600px

800px 4000px

3000px

12,000,000 pixels480,000 pixels

Pixel = picture element. The building block of a digital image.More pixels will build a bigger picture.

600px

800px 4000px

3000px

12 megapixel1/2 megapixel

A computer screen is nowadays usually set at 1024 x 768 pixels.This is the Screen Resolution.

768

1024

A computer screen is nowadays usually set at 1024 x 768 pixels. A photo sized 1024 x 384 pixels covers half of that screen.

384

1024

A computer screen is nowadays usually set at 1024 x 768 pixels. A photo sized 512 x 384 pixels covers 1/4 of that screen.

384

512

A computer screen is nowadays usually set at 1024 x 768 pixels.Here’s our 1/2 MP image on the screen.

800

600

A computer screen is nowadays usually set at 1024 x 768 pixels. Here’s our 12MP image on the screen.

800

3000

4000

A computer screen is nowadays usually set at 1024 x 768 pixels. Here’s our 12MP image on the screen.

3000

4000

The resolution of images on a computer screen is measured in pixels.

768

1024300 x 200

500 x 350

The resolution of images on a computer screen is measured in pixels.

300 x 200

500 x 350

Our 12MP cannot be resolved on thisscreen without reducing its size.

768

1024300 x 200

500 x 350

Our 12MP cannot be resolved on thisscreen without reducing its size.

Pixel = picture element. The building block of a digital image.More pixels will build a bigger picture.

600px

800px 4000px

3000px

12 megapixel1/2 megapixel

Camera Image Resolution.More pixels will build a bigger picture.

600px

800px 4000px

3000px

12 megapixel1/2 megapixel

320 x 240 800 x 600

1600 x 1200 2592 x 19443264 x 2448 3840 x 21604000 x 3000

Camera Image Resolution.More pixels will build a bigger picture.

600px

800px 4000px

3000px

12 megapixel1/2 megapixel

320 x 240 800 x 600

1600 x 1200 2592 x 19443264 x 2448 3840 x 21604000 x 3000

Camera Image Resolution.More pixels will build a bigger picture.

600px

800px 4000px

3000px

12 megapixel1/2 megapixel

320 x 240 800 x 600

1600 x 1200 2592 x 19443264 x 2448 3840 x 21604000 x 3000

PrintingResolution

Which picture has higher resolution?

A

B

Which picture has higher resolution?

A

B

A

Which picture has higher resolution?

B

A

Which picture has higher resolution?

B

Which picture has higher resolution?

B

A

Which picture has higher resolution?

A

B

NOW…

Which picture has higher resolution?

A

B

NOW…

Which picture has higher resolution?

A

B

Both have good resolution!

Which picture has higher resolution?

What happened?

A

B

Which picture has higher resolution?

What happened? The DPI changed. ( Dots Per Inch )

A

B

The building block of a digital print.

More dots will build a bigger print.

DPI - Dots Per Inch

The building block of a digital print.

More dots will build a bigger print.

DPI - Dots Per Inch

The building block of a digital print.

More dots will build a bigger print.

DPI - Dots Per Inch

Enlarging a picture “spreads out” the dots - fewer in each square inch.

Enlarging a picture “spreads out” the dots - fewer in each square inch.

Enlarging a picture “spreads out” the dots - fewer in each square inch.

But where do the dots come from?

The dots are pretty much the same as the pixels.

More pixels = more dots = greater enlargement.

More pixels = more dots = greater enlargement.

More pixels = more dots = greater enlargement.

More pixels = more dots = greater enlargement.

More pixels = more dots = greater enlargement.

More pixels = more dots = greater enlargement.

A picture with more pixels can be enlarged morebefore its resolution starts to deteriorate.

A photo with more pixels can be enlarged moreas a print before its resolution starts to deteriorate.

Size of image dictatesmaximum print enlargement .

Digital Image

Print

2MB 4MB

exceeding maximum = lower print resolution.

Goal = best print resolution.

300 dpi 170 dpi

300 DPI -photos in books and better magazines.

170 DPI -photos in newspaper.

Say you want to print 8x10s at 300 DPI.How many pixels do you need?

10 inches

8 inches

Say you want to print 8x10s at 300 DPI.How many pixels do you need?

10 inchesx

300dpi

8 inches x 300dpi

3000

2400

Say you want to print 8x10s at 300 DPI.How many pixels do you need?

10 inchesx

300dpi

8 inches x 300dpi

3000

2400

7,200,000 pixels

Say you want to print 8x10s at 300 DPI.How many pixels do you need?

10 inchesx

300dpi

8 inches x 300dpi

3000

2400

7,200,000 pixels

7.2 megapixelCamera

Millions of pixels

make up a digital image

megapixels( millions of pixels )

Millions of pixels

make up a digital image

megapixels( millions of pixels )

Each can have itsown value (lightness).

And, if in color, its own hue

andsaturation.

A silver basedphotograph hasbillions of grains.Each can have its

own value (lightness).

And, if in color, its own hue

andsaturation.

artist, Aubrey Beardsley

Heather Ackroyd and Dan Harvey

Digital image resolution - PPI - Pixels Per Inch

Print resolution - DPI - Dots Per Inch

For practical purposes : Pixel = Dot

Millions of pixels

make up a digital image

megapixels( millions of pixels )