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Title: Optimum Image Size for BBS 新聞組照片檔最佳大小 Post by Mike Kilburn on Apr 14th, 2003, 9:20pm Hi Everyone It is real pleasure to see the superb results of HKBWS members and to enjoy some of the birds I do not get to see. Could I ask technical question and make a request: Is it possible to keep images to less than 70 or 80 kb and still maintain clear on-screen definition? I do not know enough about computers to know if it is possible. I write on behalf of all those with 56K connections who have to wait a long time (make many "refresh Page" requests and sometimes totally fail to download pictures. I look forward to your expert opinions and to enjoying more pictures. Cheers Mike |
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Title: Re: Image size Post by BLee on Apr 10th, 2004, 6:47pm Dear all, I would like to know as well. Could any body teach me ? Thanks BLee |
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Title: Re: Image size Post by Webcreeper on Apr 10th, 2004, 8:14pm on 04/10/04 at 18:47:22, BLee wrote:
Dear BLee, Do you refer to the following question by Mike? "Is it possible to keep images to less than 70 or 80 kb and still maintain clear on-screen definition? " I think the answer is yes. You can see that most images posted here are less than 80 kb. Of course, I believe the quality of some photos can be shown even better if we don't have the constraint in file size. Regards, Webcreeper |
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Title: Re: Image size Post by Webcreeper on Apr 10th, 2004, 11:40pm The first photo posted by Isaac Chan today contains lots of details: http://www.hkbws.org.hk/cgi-bin/yabb/YaBB.pl?board=PhotoGallery;action=display;num=1081603687;start=0 The size of the file is 107KB. I have produced copies at three different levels of lower resolution, 38KB, 63KB, and 84.4KB respectively. The effects are compared below: Top right of photo: 38KB 63KB 84.4KB 107KB (Original) http://netalbum.netvigator.com/photos/2004/04/10/b3331161240511301081609132365.jpg?1081609480137 http://netalbum.netvigator.com/photos/2004/04/10/b3331161240512951081609133934.jpg?1081609511703 http://netalbum.netvigator.com/photos/2004/04/10/b3331161240514291081609135538.jpg?1081609533299 http://netalbum.netvigator.com/photos/2004/04/10/b3331161240517891081609130832.jpg?1081609423217 Bottom left corner of photo: 38KB 63KB 84.4KB 107KB (Original) http://netalbum.netvigator.com/photos/2004/04/10/b3331161240513781081609143406.jpg?1081609569719 http://netalbum.netvigator.com/photos/2004/04/10/b3331161240514971081609145069.jpg?1081609588061 http://netalbum.netvigator.com/photos/2004/04/10/b3331161240517061081609146822.jpg?1081609606186 http://netalbum.netvigator.com/photos/2004/04/10/b3331161240517161081609138311.jpg?1081609551279 Marginal improvement in quality diminishes with file size. Most bird photos contain much less details than this example (large areas of sky, water or blurred background). They can be kept under 50KB without any appreciable effect on quality. |
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Title: Re: Image size Post by 假鳥迷 on Apr 11th, 2004, 12:11am on 04/10/04 at 18:47:22, BLee wrote:
I used this way, quite useful: Original size of picture (sample): 1064 x 768 pixel, approx 110kb 1. Resize it to 600 pixel in length: http://www.hkbws.org.hk/fileServer/PhotoG/abcd/photo_1.jpg 2. Save it to lower quality, adjust the level as you wish. I try to save it to lowest quality this time... http://www.hkbws.org.hk/fileServer/PhotoG/abcd/photo_2.jpg 3. It make a bit difference, the file size is 20kb. It is up to you to consider the quality. I could see the details through my monitor. How about you? http://www.hkbws.org.hk/fileServer/PhotoG/abcd/123.jpg |
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Title: Re: Image size Post by Forrest FONG on Apr 11th, 2004, 12:12am Please kindly take a look of my previous message regarding the quality of photos to be posted in BBS:- http://www.hkbws.org.hk/cgi-bin/yabb/YaBB.pl?board=PhotoGallery;action=display;num=1052442967;start=0 Cheers, Forrest 8) |
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