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The difference a camera and post-production can effect the image.

Here are a few sample to show the difference between my constant companion pocket camera, the Casio EX-Z550, my Nikon D60 and my new Nikon D5100. These are re-sized to upload, but the second photo shows how CROPPING can change / improve that photo, yet still keep image quality.


Casio EX-Z550 14.1 Mpx . 4x Optical zoom 26-104mm. F2.6 - F5.9


Casio EX-Z550 Original file size 3648x2736 (resized to 800x600 for upload)


This image was cropped to 800x600 px


Samitivej Hospital, Si Racha.   Casio EX-Z550 Original file size 2816x2112 (resized to 800x600 for upload)


This image was cropped to 800x600 px


Nikon D60 dSLR with standard 18-55mm lens. 10 Mpx CCD


Nikon D60 with the 18-55mm kit lens. Original file size 3872x2592 (resized to 800x525 for upload)


This image was cropped to 800x600 px


Nikon D60 with the 18-55mm kit lens. Original file size 3872x2592 (resized to 800x525 for upload)


This image was cropped to 800x600 px

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Nikon D5100 body 16.2 Mpx CMOS with a Nikkor AF-S DX 18-105MM F/3.5-5.6G ED VR lens


Nikon D5100 fitted with 18-105 mm lens. (Full zoom setting) Original file size 3872x2592 (resized to 800x525 for upload)


This image was cropped to 800x600 px


Nikon D5100 fitted with 18-105 mm lens. (Full zoom setting) Original file size 3872x2592 (resized to 800x525 for upload)


This image was cropped to 800x600 px


Now for the shocking truth about the need for Cameras with ever increasing MEGAPIXELS .....

I bought my first Digital Camera in 1999 and it cost 10,000 Baht second hand. It was a Sony Mavica FD5 , which was fixed image size 640 x 480. (Which is 300kb) It had a 10 times optical zoom and stored the photos on a 3.5" 1.44Mb HD floppy disk. Settings were JPG in Fine and Standard, with a setting for uncompressed, which was one photo per Floppy Disk. At "S" setting, you got about 40 photos on the 1.44mb disk!


Sony Mavica FD5 with Floppy Disk storage

Here is an example photo of a pub called The Falkland Arms, Gt Tew in England taken in 1999:


This is the original photo taken in 1999. It is 640x480 and 34.1kb in size


For this photo I used Photoshop to "Crop" the image to 800x600, which in fact ENLARGED the image. File size now 122.5Kb

The other month, I got an image of 42 kb printed by the Fuji Shop as a 10'x15' enlargement, and the print was surprisingly good - The image just a little soft.

I upgrade for better features (Nikon D60 has No Video - D5100 has HD Video, CMOS sensor and better low light quality and)


Section added: 09-NOV-11

I have been doing Digital work since 1999, and now can count 17 cameras that I have used. Currently still using FIVE! 2 dSLRs (Nikon D60 and D5100, Waterproof Olympus Tough 8000 and the Pink Fiji Z33WP for my Songkran photos, plus the every present Casio EX-Z550 in my pocket).

I learnt my craft almost 50 years ago at Camera Classes in the UK, using a RollieCord Twin Lens Reflex with 120 size film.

Now to the present day. I now prefer to take more general photos and crop out a single or multiple images from the same frame, so never bother with EXIF data, which is saved in the .JPG image when it is saved on the membery card. I am not aware if EXIF data is retained after post-production manipulation. I was also told to "Save Image Only for Web" (Using PhotoShop or alternative), to cut down file size for up/download (or email), due to Bandwidth allowances. This is usually 50% the image size, compared to "Image plus data", and reduces much more when saving a photo as a thumbnail.

I have been asked the explain what happens when you want to reduce the size of the image for uploading or sending to someone via the internet. Also, when I want to "Crop" a photo, to make it look better for printing by the Fuji/Kodak shop, I reduce images to 1,200x1,800px for 4"x6" (4R) prints, the quality of which I find acceptable. (That works out at 300dpi, which is normal printer dpi)

Here I show 2 photos as example, with the 2nd cropped to a centre section of the image:

The Nikon D5100 has a 16.2 Pixel CMOS Sensor, which lets you record images in the following dimensions:
Large: 4,928x3,268, pixels; Medium: 3696x2448 pixels;Small: 2,464x1,632 pixels.
The following images were taken at "Medium" setting, and JPG Compression "Standard - 1:8"

 
The first is taken THROUGH the window of my hotel in Bangkok using the Nikon D5100 with lens set at 18mm (18 DX = 27mm 35mm Film).
Base photo: 3696x2448 px = 2.5Mb, Full image cropped to 800x525 for upload = 237kb, Save as Image only = 104 kb

The second was taken at 105mm (105 DX = 157mm 35mm Film).

The third was a crop out of the second photo - The haze partially due to the hotel window glass clarity.

This one saved as normal image - 162kb

This one saved as "Image only" 57 kb
Base photo: 3696x2448 px = 1.8Mb, Selected part of image cropped to 800x6525 for upload = 162kb, Save as Image only = 57 kb

 
 

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