| Author |
 Replies: 103 / Views: 10,368 |
|
|
|
Pillar of the Community
 United States
4038 Posts |
Quote:
...I do have a question about sharpness though. There is a box to check for 200% image. When I click it, it almost seems like it is too much to get proper focus. Is that beyond the lens or sensor capabilities? Yes, way beyond. Pretty much there is no more information in the 200% image than in the 100%, the same info is just spread across more pixels. In fact if you pull back twice the distance from your monitor, it will look exactly the same. But sometimes it's better to have the image bigger to aid in focusing, for instance if you need to wear glasses to see the screen clearly. Quote:
How does it decrease the sharpness? When downsizing is done, each pixel in the final image is a calculated "average" of the pixels around it. Integer downsizing results in a better averaging than non-integer. But you can try it yourself. Take an image and downsize it by 1.9x, 2x, and 2.1x and compare. What you will see is actually fairly subtle, but noticeable. You can get back some of the sharpness with a little extra sharpening. |
|
Pillar of the Community
 United States
717 Posts |
Thank you so much for sticking with us bumbling beginners. All the time you spend helping us is greatly appreciated!
|
|
Pillar of the Community
United States
1476 Posts |
Quote:
When downsizing is done, each pixel in the final image is a calculated "average" of the pixels around it Ok, that's about Downsizing, but what about Rotating the image? You mentioned that it can alter the sharpness as well. Or is it apples and apples? |
|
Pillar of the Community
United States
4038 Posts |
Sort of the same thing. When you rotate the image, each pixel needs to be recalculated as a composite of the originals. The center pixel(s) don't change, but as you move farther from the center there is more movement and each pixel gets recalculated.
Contact me for photographic equipment or visit my home page at: http://macrocoins.com |
|
Pillar of the Community
United States
717 Posts |
Dar, please don't get confused with flipping the picture 90 degrees before processing. He is talking about rotating it a few degrees with the rotation tool. I did that to get the word lined up properly, and it regenerates the picture.
|
|
Pillar of the Community
United States
717 Posts |
Or, maybe he does mean that, I have been wrong before.
|
|
Pillar of the Community
United States
4038 Posts |
No, a 90-deg rotation does not harm the image...
|
|
Pillar of the Community
United States
1476 Posts |
Ah.. That's different then. I have just been rotating 90 degrees is all. Now I understand what you are talking about loosing sharpness. Thank you!  |
|
Pillar of the Community
United States
717 Posts |
My quest to take accurate pictures of MS Zincolns continues. I think I am getting closer, as this picture has a bit better color, and looks more like a shiny cent than the others. Let me know what you think.  |
|
Pillar of the Community
United States
4038 Posts |
Still seeing bright edges and dark surfaces on the devices. What is the angle your lights make to horizontal?
Contact me for photographic equipment or visit my home page at: http://macrocoins.comEdited by rmpsrpms
06/03/2015 09:45 am
|
|
Pillar of the Community
United States
717 Posts |
That one was taken inside a milk jug diffuser. the lights were approximately 45 degrees to the jug, then I moved one around until it caused the flare of luster.
|
|
Pillar of the Community
United States
717 Posts |
Here is a silver proof quarter taken with jansjos diffused with kleenex about 70 degrees 11 and 2 and 6" from the coin.   |
|
Pillar of the Community
United States
1476 Posts |
Nice shot! This has to be my personal favorite of this years ATB's as well!  |
|
Pillar of the Community
United States
4038 Posts |
Those proof shots are better than I've ever been able to do. I seem to have a wall between me and good proof shots.
I recommend highly against using the milk jug diffuser. It makes the coin look "inverted", ie darks are light and lights are dark.
Contact me for photographic equipment or visit my home page at: http://macrocoins.com |
|
Valued Member
Australia
90 Posts |
gymcoachdon, Don't be afraid to consider other forms of lighting. For this shot, (my only shot of a US cent) I used Two 18w Cool White Compact Flouro table lamps, raised to about ten inches from coin at the 10am-2pm standard position. Not an award winner but worth trying.  For high gloss deep cameo proofs, two lights were too much Reduced to a single 18w at 12:00pm, still some hot spotting but not a bad outcome. The coin is still in it's acrylic capsule.  |
| |
Replies: 103 / Views: 10,368 |
First Page
Previous Page
Posted 05/31/2015 10:47 pm
