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Re-sizing

MrB
Posted 21/10/2017 - 14:01 Link
Thank you, Nigel - a 100x70cm print sounds really impressive. I must have a go at that sometime, Like you, when I downsize for the Web I always use the 'Bicubic Sharper' feature (but in PaintShop Pro), which seems to work very well and the images then appear to need little or no further sharpening.

Am I correct in thinking that this forum will display at no more than 800px wide?

Cheers.
Philip
derek897
Posted 21/10/2017 - 14:18 Link
Just so I'm understanding this correctly, are some of ye sharpening twice, once during pp and again after
re-sizing ???
I know what i like, If not always why.
pschlute
Posted 21/10/2017 - 14:19 Link
MrB wrote:


Am I correct in thinking that this forum will display at no more than 800px wide?

Cheers.
Philip

If you upload from your computer it gets resized to 800 wide, but if you link to say a Flickr image it gets displayed larger
McGregNi
Posted 21/10/2017 - 14:52 Link
derek897 wrote:
Just so I'm understanding this correctly, are some of ye sharpening twice, once during pp and again after
re-sizing ???

Hi Peter, there are two types of workflow sharpening ....Capture and Output.

Capture sharpening is to correct for any inherent softness at the point of capture ...eg the effect of an AA filter . Also it is to take account of the subject type ...eg portraits or architecture, which would demand different amounts of Capture sharpening.

For camera jpegs then this process is applied via the custom image settings. For RAW then the process is applied in the RAW converter. The RAW advantage is of course that it can be selective, eg only for the eyes of a portrait.

Output sharpening is the last step before outputting a new version of your image....eg a jpeg for printing or a smaller one for the web. Both of these would demand a different account also (generally the larger images for print needing more).

I believe that many photographers do not apply sufficient Capture or Output sharpening, or miss one out altogether.
My Guides to the Pentax Digital Camera Flash Lighting System : Download here from the PentaxForums Homepage Article .... link
Pentax K7 with BG-4 Grip / Samyang 14mm f2.8 ED AS IF UMC / DA18-55mm f3.5-5.6 AL WR / SMC A28mm f2.8 / D FA 28-105mm / SMC F35-70 f3.5-4.5 / SMC A50mm f1.7 / Tamron AF70-300mm f4-5.6 Di LD macro / SMC M75-150mm f4.0 / Tamron Adaptall (CT-135) 135mm f2.8 / Asahi Takumar-A 2X tele-converter / Pentax AF-540FGZ (I & II) Flashes / Cactus RF60/X Flashes & V6/V6II Transceiver
Edited by McGregNi: 21/10/2017 - 14:54
derek897
Posted 21/10/2017 - 14:54 Link
Ok i have just edited an image and saved it a couple of ways to see how this works, just posting here to see if there's much of a difference

1st one my normal way from a 17.5mb image 6000 px long side

Comment Image


2nd one saved for web, quality 40% to get the file size down low enough, bicubic sharper, 6000 px long side

Comment Image


last one saved for web, bicubic sharper, 1000 px long side

Comment Image
I know what i like, If not always why.
McGregNi
Posted 21/10/2017 - 14:59 Link
I can't see anything in it Derek .... I'm only on my phone at the moment though. But there's clearly no point in uploading the bigger files.
Edited by McGregNi: 21/10/2017 - 15:09
derek897
Posted 21/10/2017 - 15:02 Link
I can't see anything in it either Nigel, on this site.
Unless viewing actual image on my pc. As I try to zoom in on it the 1000 px one falls apart as I zoom in.
I know what i like, If not always why.
McGregNi
Posted 21/10/2017 - 15:08 Link
Yes, so I think the right approach is to produce the smaller ones, optimised for the web with the bicubic sharper process, for the forums. This saves server space and helps your threads load quickly. In the case of this forum it may be that the photos get resized automatically, so there's probably little difference anyway, except the uploading speed.

The nice thing about using a dedicated process dialogue such as PhotoShops "save for web" (and no doubt the same for Philips PaintShop Pro), is that we don't have to do any calculations to figure out the correct sharpening settings (radius and amount) .... It's all sorted automatically based on the image size and quality settings.
My Guides to the Pentax Digital Camera Flash Lighting System : Download here from the PentaxForums Homepage Article .... link
Pentax K7 with BG-4 Grip / Samyang 14mm f2.8 ED AS IF UMC / DA18-55mm f3.5-5.6 AL WR / SMC A28mm f2.8 / D FA 28-105mm / SMC F35-70 f3.5-4.5 / SMC A50mm f1.7 / Tamron AF70-300mm f4-5.6 Di LD macro / SMC M75-150mm f4.0 / Tamron Adaptall (CT-135) 135mm f2.8 / Asahi Takumar-A 2X tele-converter / Pentax AF-540FGZ (I & II) Flashes / Cactus RF60/X Flashes & V6/V6II Transceiver
Edited by McGregNi: 21/10/2017 - 15:14
Algernon
Posted 21/10/2017 - 16:02 Link
Derek, the forum software has reduced all these to 532p wide in my case, but the last one is way better than the first. By a big margin

--
Half Man... Half Pentax ... Half Cucumber

Pentax K-1 + K-5 and some other stuff

Algi
derek897
Posted 21/10/2017 - 16:10 Link
Mmm as I usually link through flickr apart from gallery uploads, I wonder is it worth it. Algi can you see a difference between the last 2 as they have both had bicubic sharper saving method. Might be worth doing it that way instead of just reducing file size.
Good thread lots of interesting points and learning curves.
I know what i like, If not always why.
Algernon
Posted 21/10/2017 - 16:22 Link
Nothing in it between the last two apart from one looking very slightly different in terms of colour, but it might be an illusion.

At 532p wide nothing is going to look too good on this site

--
Half Man... Half Pentax ... Half Cucumber

Pentax K-1 + K-5 and some other stuff

Algi
JAK
Posted 21/10/2017 - 16:30 Link
Algernon wrote:
Derek, the forum software has reduced all these to 532p wide in my case,

The long side is 800p.
John K
McGregNi
Posted 21/10/2017 - 16:37 Link
On an iPad now, better screen, and there's almost nothing between them .... at most the last one has the tiniest edge in extra sharpness. I'd assume that the bicubuc sharper effect was more due to the greater size reduction. So it seems that smaller is better!
My Guides to the Pentax Digital Camera Flash Lighting System : Download here from the PentaxForums Homepage Article .... link
Pentax K7 with BG-4 Grip / Samyang 14mm f2.8 ED AS IF UMC / DA18-55mm f3.5-5.6 AL WR / SMC A28mm f2.8 / D FA 28-105mm / SMC F35-70 f3.5-4.5 / SMC A50mm f1.7 / Tamron AF70-300mm f4-5.6 Di LD macro / SMC M75-150mm f4.0 / Tamron Adaptall (CT-135) 135mm f2.8 / Asahi Takumar-A 2X tele-converter / Pentax AF-540FGZ (I & II) Flashes / Cactus RF60/X Flashes & V6/V6II Transceiver
Edited by McGregNi: 21/10/2017 - 16:39
Algernon
Posted 21/10/2017 - 16:40 Link
Just had another look the colour is better on the 2nd especially the greens
No guarantee that that will always be the case though.

--
Half Man... Half Pentax ... Half Cucumber

Pentax K-1 + K-5 and some other stuff

Algi
Edited by Algernon: 21/10/2017 - 16:53
derek897
Posted 21/10/2017 - 16:46 Link
I have a really crappy monitor, its so old i cant update the drivers and the colour profile is out. its fine in ps but all photo viewers are slightly of whack colour wise, so its hard for me to tell.
The next lot of photos I do I will give this method a go.
I know what i like, If not always why.

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