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1911 Picture Example


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A 1911 Commemorative, and ''Image Burden'' -

Let's just look at one firearm's picture and make some observations. The original photograph was taken on a Kodak DX6340 3.1 Mega Pixel camera - giving an original of 2031 x 1524 pixels, at 230 DPI. This would equate to a print size in inches of 8.8" x 6.6" .... large enough for most purposes, tho a reduction in DPI or, a higher MegaPixel figure would achieve an 8 x 10 probably. Lighting was primarily fluorescent almost over head, with a small amount of tungsten fill-in..

Let's tho be more concerned with displaying on the THR. So - this pic is way too large, both physically in pixels and as a file, even with strong JPG compression. Quality is quite good but - we have to reduce it to some more reasonable level.

I personally consider that it is adequate to show a picture with a max dimension not exceeding 600 pixels (I know - many don't agree!!), which avoids scrolling off on the horizontal for those not on high resolution monitor screens. This one is slightly cropped and compressed to about 10:1, giving a file size around 56k ..... good for download speed.

So - this picture is now, 550 x 347 (230 DPI), after cropping and reduction (linear interpolation), and saved at a compression of 10:1 yielding a file size of about 56k (after decompression, about 600k in memory). Agreed, some resolution is lost but it shows enough IMO to serve a purpose... although restricted to 550 here because of layout limitations ..... 600 would be just that bit better and filesize perhaps then nearer 70k ..... still not too bad.

Commemorative 1911, 550 x 347, 56k filesize.

Let us now though just look at a portion from the original ..........

This is sampled as a 550 x 413 from the 2031 x 1524 original, it is showing the definition at max. Nice, but impractical to use full size. Thus the reduction process we saw in the first image.

Sample from original image

One further interesting comparison though .... is to take a similar sample from the reduced image, and enlarge back to ''original'' size....

Notice now how, predictably, resolution has diminished a lot. If however we reduced that back down to the scale in the top picture .... and look at it within that image - it in fact looks passable, because of the ''averaging'' effect when viewed at that scale. A compromize for sure but, still conveying useful information.

Enlarged effect of reduction

''Image Burden'', some figures -

Let me just mention some figures regarding ''image page burden''. Say you have a page of 20 posts and each one has one image ..... if all those images are large to the tune of 800 pixel or even bigger, then apart from some chance of scrolling horizontally being required, filesizes could well be in the region of 150k to 200k each. Thus an image download burden of about 3Mb to 4Mb ....... considerable for dial up people, even if quality is good.

Now relate the same to where all images were around 50k. What then? The max image burden would be about 1Mb!! Still will need some waiting to see them all, unless some were cached earlier, but much more bearable!

Ok, perhaps by now you are well saturated!! I hope though you are beginning to see some of the relationships between the various elements of the image process and what sizes can work best.

Go look at another extra page dealing with similar aspects .... showing various sizes of my favorite .454 muzzle flash pic', and some data.

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