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Forum: Troubleshooting and Beginner Help 06-07-2022, 01:23 PM  
What is Bokeh and how do I get some of it?
Posted By Tiffa
Replies: 69
Views: 3,493
In the original Japanese there is no 'h' in boke it was added by an American author when he sent in an article about it to a magazine. A few years later Amateur Photographer picked up on the article and used the same spelling. Maybe that could alter the meaning.

Chris
Forum: Troubleshooting and Beginner Help 06-07-2022, 11:27 AM  
What is Bokeh and how do I get some of it?
Posted By Tiffa
Replies: 69
Views: 3,493
Back in the 1970's I was in Japan when bokeh was all the rage.
It came about because of a small group of very good photographers usually using very basic equipment with very simple lenses, doublets and triplets, created images where nothing was in focus deliberately because they loved the soft blur that these lenses gave, they even moved the camera to maximise blur and other techniques.

Photographer such as
Shomei Tomatsu

Eikoh Hosoe

Daido Moriyama

And others, needless to say most other photgraphers in Japan did not agree and devised the term Bokeh for this effect which in Japanese means idiot, fool or blurry thinking. It is similar to our 'chasing a rainbow', the more you look for it the further away it goes.

Mention Bokeh to a Japanese photographer and he will usually smile knowingly.

Chris
Forum: Pentax DSLR Discussion 04-29-2022, 02:00 AM  
Decent photo editing software..?
Posted By Tiffa
Replies: 74
Views: 8,649
The RAW data is just that it's ALL the data the sensor recorded and that is much more than any single file can resolve.

Lets take a common problem, an interior in a darkish room with a window that has bright daylight. If you convert the file to a Jpeg it will try to encompass all the dynamic range in the file .

Dynamic range is the number of f stops in the brighter pixels before they just reproduce as white, there is no detail data in these pixels.

Likewise the darker pixels go readily to black, again no data to give detail in these parts of the image.

But this data is still available in the image file and by selecting say the bright sky and turning down the exposure you will get the sky detail back. What we've done is to reign in the bright pixels so that your output device (monitor or printer that have limited dynamic range) to be able to re-produce those pixels, the same applies to the darker parts of the image too by selecting and then increasing exposure in these pixels.

The same happens with colour balance too. The sRGB used in Jpeg files just cannot reproduce any bright red or blue. Jpeg is reasonable in reproducing the colours in nature, only poppies can't be reproduced correctly and are usually a red blob of tertiary pixels, any man-made bright dyes say in anoraks can't reproduce correctly either.

There are programs that can draw the data from a RAW file and bring any pixel within the range of any output device, I use Photomatix Pro which you can try for free (it puts a watermark on the output, but offers all the tools) and you can see just how much data can be retrieved from a single RAW file. If your camera can bracket shots Photomatix will use ALL the data from multiple RAW files taken with different exposures. I take just 3 images 2 stops apart. Pentax are great at taking bracketed shots just use the drive button to select on the fly, very quick.

Once you save as Jpeg all this extra data is just dumped which is why the files are smaller, High Dynamic Range black and white images can be really stunning with high levels of detail throughout the image.



Cheers Chris
Forum: Pentax DSLR Discussion 04-20-2022, 01:06 AM  
Decent photo editing software..?
Posted By Tiffa
Replies: 74
Views: 8,649
Any version of Photoshop will open any DNG file so you can use older versions of Photoshop if you set DNG as your RAW format. I have seen (and used) a free CS2 download.

Chris
Forum: Monthly Photo Contests 03-10-2020, 03:18 AM  
Yearning For Spring
Posted By Tiffa
Replies: 12
Views: 351
I would like to nominate this photo
Forum: Monthly Photo Contests 03-10-2020, 03:18 AM  
Rocks
Posted By Tiffa
Replies: 19
Views: 667
I would like to nominate this photo
Forum: Winners' Showcase 08-08-2019, 08:36 AM  
July, 2019 Winner: Merlot Dawn
Posted By Tiffa
Replies: 75
Views: 4,677
I would like to nominate this photo
Forum: Monthly Photo Contests 08-08-2019, 08:35 AM  
Red Coupes
Posted By Tiffa
Replies: 18
Views: 487
I would like to nominate this photo
Forum: Welcomes and Introductions 07-03-2019, 01:01 PM  
Long time Pentax user
Posted By Tiffa
Replies: 8
Views: 523
Thanks all for the welcome, looking forward to joining in

Chris
Forum: Welcomes and Introductions 07-03-2019, 12:56 AM  
Long time Pentax user
Posted By Tiffa
Replies: 8
Views: 523
Hi all, Hello from the UK, a little place called Eckington halfway between Shefffield and Chesterfield. I've been using Pentax since I got my S1a in the 60's when most SLR cameras used the M42 thread for mounting lenses, then on through the Spotmatics and ME Super to the digital age, currently using the K-1 , though I also use the M4/3 system with Olympus and Panasonic as it's a lot lighter to carry on these old bones.

One of my favourite cameras is the much maligned Pentax Q it really is a remarkable camera I have 2 of them they're so useful for attatching to microscopes and telescopes, a use which seems to be overlooked.

Chris
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