Episode 114: Secrets of a Portaloo!

114
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You can win a book in our two contests – the exact rules will be published in the next posting.

I continue to work on my project “Access Control”. My target is a photo book by blurb.com. They accept PDF files for printing – which is important for me because most of the book making software of the printers doesn’t work on Linux. Of course there is an Open Source program for making a PDF – Scribus. It is available for all OS, even OS/2. I’ll tell you about my experience in one of the next episodes.

A bit of Magic is shown by Philippe – and I have confess that I used an old version of his script. You’ll see better ones next time.

There are a lot of photobooks to look at for inspiration at SOFOBOMO.

Then I start to edit an image. The JPEG image is a bit overblown in the highlights and I have to go back to the RAW file. Cropping turns out to be difficult and the image needs a bit of a contrast boost in some parts.

The final steps – sharpening and deciding about a vignette will be made when the layout of the book is clear. For sharpening one needs to kknow the output resolution and size – and I will have to scale the image to 300 DPI before putting it into the book. The vignette depends on the background of the page.

The TOC

00:20 The Book Challenge
05:20 A Photo Book as the target for “Access Control”
07:50 Scribus for making PDF files
10:00 Photobooks to look at
10:35 Editing an image for the book
11:15 Blown out pixelss
11:45 RAW to the rescue with UFRaw
16:28 Comparing JPEG and UFRaw output
18:50 Correcting a colour cast in UFRaw
20:45 Straightening the image
23:00 Cropping the image
26:50 Improving contrast with a layer in overlay mode and a mask
33:20 Crooping more
35:00 What’s left to do

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Episode 076: UFRaw revisited

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I got a mail from Pascal de Bruijn, the man behind the p-code blog. He knows a lot about colour management, RAW processing and so on. He had seen episode 11 and pointed me to some errors and stuff that is new in UFRaw. So I read his mail and had a look.

This is really a fast forward through the program, nothing really in depth. It can be a guide for experimenting. If you know not much about RAW processing, have a look at episode 11. It covers some basics about the technology behind it.

I used the UFRaw version compiled by Pascal. You can find it for Ubuntu on his site – other OS have to look around. Start with the UFRaw home page.

I’ll have an eye surgery tomorrow (lens replacement) and had not much time to prepare this episode. TOC and more will follow. And I’ll be off screen for some days until I am allowed to read again.

The TOC

0:00 Intro
0:26 Statistics
1:50 Pascal’s e-mail blog.pcode.nl
4:16 – Fire up UFRaw!
4:30 – Color matrix vs. Color profile
5:57 — Working Color Space Profile
6:33 — Rendering Intent Option
8:50 – Details Restauration & Highlight Clippings
10:13 – Import base curves from .NCV
10:26 – Auto black point correction works perfectly!
11:13 – New features in new version of UFRaw
11:36 – LensFun
14:00 – Fix cromatic aberration
15:57 – Optical Vignetting
16:23 – Lens distortion – Panotools
17:16 – Lens geometry
19:18 Outro

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Episode 062: Noise in the Dark!

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I am through a bad cold and nearly through an iris inflammation and so I loved to talk – you get a double dose of MTG tonight. Philippe helped me out last week – and he will be a regular contributor after that success.

After I solve the mystery behind the menue entry “Edit/Fade” I tackle an old image. Taken 4 years ago with my old camera (Nikon D70) at ISO 1600 and f=1/1.8. It’s noisy.

I use the noise reduction from UFRaw and combine two results of the RAW conversion – one with and one without noise – to one. As with the selective sharpening I left the edges of structures noisy and kept the noise out of the structureless areas. Of course this is done with layers and masks. with this technique you keep the structures crisp and the noise out.

After finishing this video, I found out that UFRaw has a well hidden option for removal of chroma noise. More next week.

This image still needs some work on it – I’ll show that in the next episode.

Joel has a lot to say about noise and I’ll go into some other noise reduction techniques in the future.

The TOC:

03:15 Edit/Fade
09:55 The image in UFRaw
14:45 Noise
16:40 Noise reduction in UFRaw
19:10 Comparing the images
22:50 The Plan
23:35 Making a layer mask with “Edge Detect”
29:40 Recap
30:40 Fine tuning with another layer
38:50 Rotating
41:50 Cropping


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Episode 036: Nightvision on a lazy Sunday Afternoon

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This week you are in for a strange show. I try to make an image out of a not so good night shot by Stuart Martin from New Zealand. Stuart had his camera for three days and was experimenting with it. He shot the Christmas decora- tion of his neigh- bour but only got a dark and a bit blurry image.
With no specific goal in mind I just played around with UFRaw and layers in GIMP and got a quite nice result. The 100% crop you see here is a bit like a painting, the full image looks like seen through night vision goggles. NightgoggleThe lesson to learn except a refresh of using UFRaw and layers: Play around! Make experiments! There is no right way – just interesting results.

Stuart has an incredible collection of links to sites about language – from fun to pure science.

Don’t forget the challenge! Make a monochrome image and post it in our meetthegimp.org photogroup at 23 and be sure to use the tag “mtg-monochrome”. The challenge ends March 31 1600GMT and I’ll draw a winner by random choice.

You can find the image used in this episode here on the Download Page

Contact me!

You can leave your comments on this blog or write me a mail.

The TOC

00:35 Welcome
02:14 The original image by Stuart Martin
03:28 The problems with the image
06:50 Examine using UFRaw
08:40 – change the colour temperature
09:15 – change the exposure
10:18 – Make the second version of the image
13:15 – Make the third version of the image
14:03 Put the 3 images as layers
15:54 Plan the composition
17:19 Rotating all the layers together
19:40 Cropping
22:50 Combining the layers
23:49 Add a layer mask
30:25 The Blog
31:06 The Black and White Challenge
32:26 Request for help with WordPress
33:20 The End
TOC made by paynekj

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Episode 015: RAW to the rescue! Mini-HDR ;-)

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I shot some autumn scenes with a Lensbaby in a very mixed light condition. And I haven’t checked the histogram after this shot. It is the only one with the focus right on spot and a dreamy flair. The leaf in the center was overexposed in the JPG image – blown out highlights ruined the image.

This is the final image – not the one with the blown out highlights….

But I had shot in JPG and NEF (Nikon’s RAW) – so I used UFRaw to produce a TIFF file with the right exposure of the leaf and blended it into the image with a layer mask. This is basically the way (pseudo-) HDR works. Take different parts of the image from differntly exposed photographs.

A slight correction with the hue/saturation tool was necessary to adjust the colours. Cropping was done twice – a mistake made a correction necessary. So I covered some advanced options in cropping.

I promised some links:

Don’t forget to make a triptych and post it in the photogroup. I’ll draw a winner for the one year 23Plus membership sponsored by 23 in show 16. So you have still time to Oct. 18 to submit an entry. The pictures there are already worth to be looked at.

Get the files used!

The files from this episode.

The TOC

00:23 Welcome
00:34 Triptych challenge
02:55 More on liquid rescale
05:36 Red Hat Magazine
07:04 The Lensbaby source image
09:47 Raw conversion using UFRaw
14:30 Open in Gimp
15:00 Add TIFF as a new layer
16:00 Aligning the layers
18:18 Add a layer mask
21:45 Adjust the hue-saturation
25:46 Crop the image
28:40 Reduce the file size by cropping the top layer
30:00 Remove a distraction using the clone tool
34:48 Resize for web
37:40 Sharpening
42:23 the End
TOC made by paynekj

Contact me!

You can leave your comments on this blog or write me a mail.

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Episode 011: RAW converting with UFRaw

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Edit: Episode 76 covers some new aspects of UFRaw and corrects some mistakes. Look at it too!

RAW conversion was a thing a lot of you wanted to know something about. And in this show I tell you how to use the program UFRaw to get RAW images into the Gimp. My job was coming a bit into the way – I had to build the schedule for my school. So this show contains some ‘should be’ outtakes and perhaps I have overlooked some stuff. Please feel free to ask – I will be glad to answer all your questions in a follow up show.

Some links:

The UFRaw home page.

A lot of camera profiles.

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Contact me!

You can leave your comments on this blog, or write me a mail.

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