Embed Size (px)
DESCRIPTION
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. 800px. 4000px. 600px. 480,000 pixels. 12,000,000 pixels. 3000px. Pixel = picture element. - PowerPoint PPT Presentation
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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
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 )
