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VK2TV > SCAN 26.03.08 22:58l 73 Lines 1680 Bytes #999 (0) @ WW
BID : 35474_VK2TV
Read: GUEST DK3UD DL1LCA
Subj: Re:Need Scan size info.
Path: DB0FHN<DB0MRW<DB0HOT<DB0ERF<DB0FBB<DB0IUZ<DB0OVN<DB0GOS<DB0RES<DK0WUE<
7M3TJZ<F6CDD<F6BVP<VK2TV
Sent: 080326/2046Z @:VK2TV.#MNC.NSW.AUS.OC #:35022 [Kempsey, QF68JX] $:35474_VK
From: VK2TV@VK2TV.#MNC.NSW.AUS.OC
To : SCAN@WW
# Generated by: TstHWin v2.21b - Registered to VK2TV
# On : 3/27/2008 7:46:49 A
# UTC: 3/26/2008 20:46:49
>From: UT1HZM@UT1HZM.KREM.POL.UKR.EU
>To : SCAN@WW
Hello again Sergej,
>
>
>Hello!
>
>>
>>From: ZR2ACJ@ZS0ELD.ELD.ZAF.AF
>>To : SCAN@WW
>>
>>ZR2ACJ/TPK 1.82 Msg N§:226 Date:22-03-08 Time:10:20 SAST (-2HRS for Z)
>>
>>Hi all,
>>Thanks for interest.
>>
>>I need info as how much (dots per inch etc.) to scan a circuit diagram, so
>>that it can be sent 7+ and not make the receiver have a heart attact!.
>>
>>Also what version to save it in...Eg: JPG, TIF etc.
>>
>>The circuit in question, is a photo copy, in black and white.
>>
>
>I'm still haven't to scanner, but know if its true B/W (not 256grey scale) picture
>its best to save in BMP format and then compress it with ZIP archiver...
>
>
>
>73, Sergej
I did some more tests to see what file sizes I ended up with. The original
document is a TNC circuit on an A4 page. I scanned at 360 DPI, and at
75 DPI.
Both were saved as bmp files and converted to jpg and tif with Irfanview.
360 DPI
bmp - 1.55MB
jpg - 3.8MB (file saved with Irfanview slider at 100 percent)
tif - 1.55MB
75 DPI
bmp - 67kb
jpg - 240kb (100 percent)
tif - 67kb
The original image was a scanned image so some quality degradation was
pre-existing.
With a 360 DPI scan, IC numbers could still be read, at 75 DPI those
numbers were a blur.
75 DPI seems fine for web based images of photos but is inadequate from
circuit diagrams.
Keep in mind the image was a full A4 sheet so a considerable reduction in
file size will be achieved with a much smaller sheet size.
Cheers ... Ray vk2tv
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