Paper Size 紙張大小 - International Standard 國際標準

我肯定不定我一個人記不牢A4紙到底有多大？
我還老是記不住相片4R的比例！

Photocopier Paper Size
Size Code	Size (mm)	Size (inch)
A4	210mm x 297mm	8-1/4" x 11-3/4"
A3	297mm x 420mm	11-3/4" x 16-1/2"
F4A	216mm x 343mm	8-1/2" x 13-1/2"
F4B	216mm x 330mm	8-1/2" x 13"
F4C	210mm x 330mm	8-1/4" x 13"
L/S	216mm x 279mm	8-1/2" x 11"
LGA	216mm x 356mm	8-1/2" x 14"
B4	257mm x 364mm	10-1/8" x 14-3/8"

The "A" Series is for General Printed Matter
Size Code	Size (mm)	Size Code	Size (mm)
A0	841mm x 1,189mm	A6	105mm x 148mm
A1	594mm x 841mm	A7	74mm x 105mm
A2	420mm x 594mm	A8	52mm x 74mm
A3	297mm x 420mm	A9	37mm x 52mm
A4	210mm x 297mm	A10	26mm x 37mm
A5	148mm x 210mm

The "B" Series is for Posters, Wall Charts
Size Code	Size (mm)	Size Code	Size (mm)
B0	1,028mm x 1,456mm	B5	182mm x 257mm
B1	728mm x 1,028mm	B6	128mm x 182mm
B2	514mm x 728mm	B7	91mm x 128mm
B3	364mm x 514mm	B8	64mm x 91mm
B4	257mm x 364mm

The "C" Series is for Folders, Post Card, Envelopes
Size Code	Size (mm)	Size Code	Size (mm)
C0	917mm x 1,297mm	C5	62mm x 229mm
C1	648mm x 917mm	C6	114mm x 162mm
C2	458mm x 648mm	C7	81mm x 114mm
C3	324mm x 458mm	C8	57mm x 81mm
C4	229mm x 324mm

資料來源/參考資料:
http://www.walkerpaper.com/paper_size.htm
http://en.wikipedia.org/wiki/Paper_size

相片尺寸的「R」制度

基本上，無論橫度定直度，長闊比例大概是3:2，這就是每張135菲的比例 (36mm x 24mm) (多謝讀者Vincent指正)。R前面的數字是較短一邊的尺寸(英吋做單位)，所以4R就應該係4″ X 6″，5R就應該係 5″ X 6.6665″，但由於計起來長的一邊未必是整數，相紙製造商就round up/down尺寸，久而久之大家公認了這標準。

3R = 3.5″ X 5″
4R = 4″ X 6″
5R = 5″ X 7″
6R = 6″ X 8″
8R = 8 X 10″
16R = 16″ X 20″

其實2R和3R短的一邊分別係2.5″同3.5″，但為了方便只稱為2R和3R，而不是2.5R和3.5R。

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MEGAPIXELS AND MAXIMUM PRINT SIZE

# of Megapixels	Maximum 3:2 Print Size
	at 300 PPI:	at 200 PPI:
2	5.8" x 3.8"	8.7" x 5.8"
3	7.1" x 4.7"	10.6" x 7.1"
4	8.2" x 5.4"	12.2" x 8.2"
5	9.1" x 6.1"	13.7" x 9.1"
6	10.0" x 6.7"	15.0" x 10.0"
8	11.5" x 7.7"	17.3" x 11.5"
12	14.1" x 9.4"	21.2" x 14.1"
16	16.3" x 10.9"	24.5" x 16.3"
22	19.1" x 12.8"	28.7" x 19.1"

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4R - 1600x1200 (2.0M)
A4 - 2274x1704 (4.0M)
A3 - 3072-2048 (6.3M)
A3+ - 3504x2336 (8.0M)

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設計4R相紙的的尺寸和分辨率

分辨率大於180dpi以上為佳

1X1.5 (1寸) 2.6*3.9 一寸2.5*3.5

1.5X2 (2寸) 3.8*5.1 大二寸3.5*5.0 小二3.5*4.5

5*3.5（5寸/3R）　　12.70*8.89

6*4（6寸/4R）　　　15.24*10.16

7*5（7寸/5R）　　　17.78*12.70

8*6（8寸/6R）　　　20.32*15.24

10*8（10寸/8R）　　25.40*20.32

10*12(12寸) 　　　 25.40*30.48

12*14(14寸）　　　 30.48*35.56

12*16(16寸)　　　　30.48*40.64

14*18(18寸)　　　　35.56*45.72

16*20(20寸)　　　　40.64*50.80

20*24(24寸)　　　　50.80*60.96

24*30(30寸)　　　　60.96*76.20

24*36(36寸)　　　　60.96*91.44

1.身份証(22mm*32mm)

2.駕駛証(22mm*32mm)

3.黑白小一寸(22mm*32mm)

4.彩色小一寸(27mm*38mm)

5.彩色大一寸(40mm*55mm)

6.普通証件照(33mm*48mm)

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1M = 1024*768

3M = 2240*1680

5M = 2688*2016

7M = 3136*2352

10M = 3648*2736

顯示解析度 http://zh.wikipedia.org/zh-tw/%E6%98%BE%E7%A4%BA%E5%88%86%E8%BE%A8%E7%8E%87

資料來源/參考資料:

http://blog.avantbiz.com/2006/09/05/photo-size-2r-3r-4r-5r/

http://www.cambridgeincolour.com/tutorials/digital-camera-pixel.htm