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Deviations associated wit...
Forum: General questions
Last Post: ajax
1 hour ago
» Replies: 7
» Views: 248
Dot for Dot and Monitor(s...
Forum: Installation and usage
Last Post: rich2005
7 hours ago
» Replies: 0
» Views: 23
Squaring the circle, circ...
Forum: General questions
Last Post: QuinB
Yesterday, 08:48 PM
» Replies: 11
» Views: 270
Windows Imaging Component...
Forum: Extending the GIMP
Last Post: Rene Slijkhuis
Yesterday, 01:02 PM
» Replies: 3
» Views: 139
The little forum that cou...
Forum: Gimp-Forum.net
Last Post: Ofnuts
Yesterday, 11:27 AM
» Replies: 46
» Views: 3,164
Export Layers plugin fail...
Forum: General questions
Last Post: rich2005
08-15-2017, 02:33 PM
» Replies: 1
» Views: 66
Very new to GIMP and look...
Forum: General questions
Last Post: Reptorian
08-15-2017, 01:47 PM
» Replies: 4
» Views: 125
Scaling and Canvass Size
Forum: General questions
Last Post: maicart
08-15-2017, 12:52 PM
» Replies: 2
» Views: 70
"Open Image" change defau...
Forum: General questions
Last Post: rich2005
08-14-2017, 10:01 AM
» Replies: 7
» Views: 156
Gimp Crashes On Startup
Forum: Windows
Last Post: BrassRaptor
08-13-2017, 09:57 PM
» Replies: 10
» Views: 212

 
  Dot for Dot and Monitor(screen) Resolution
Posted by: rich2005 - 7 hours ago - Forum: Installation and usage - No Replies

Want to print an image and check what it looks like at actual size?

By default Gimp has View -> Dot for Dot enabled. see: https://docs.gimp.org/en/gimp-view-dot-for-dot.html

This is because Gimp is a bitmap/raster editor and works in pixels not real world (inches/millimetres..) units. With Dot for Dot ON each image pixel equates to one screen (monitor) pixel.

This is a photograph of my laptop. I made a new image 100mm x 100mm at the default resolution 72 pixels-per-inch (ppi)

Important, keep to a zoom value of 100% to see correct comparisons.

When View -> Dot for Dot is ON

   

From the ruler it measures about 45mm square, Gimp uses pixels, there is a tiny rounding error when looking at Image properties, 100mm becomes 99.84mm nothing to be concerned about.

when View -> Dot for Dot is OFF

   

The canvas. 100mm x 100mm now measures the correct size.

If only it was that simple:

What you see very much depends on setting Gimp up correctly. Edit -> Preferences -> Display
Modern monitors and especially laptop screens might have a high pixel density. These are the values I use for my laptop.

   

Gimp thinks that the correct Monitor resolution is 96 ppi
Calibrate is generally broken with Gimp 2.8.x (much better in Gimp 2.9.5)
You can calculate this using / before after proportions or a bit of trial and error to obtain a value.

Why work with Dot for Dot ON

Back to Gimp is a pixel editor, when ON you have control over each pixel, when OFF Gimp will decide which pixels are changed.

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  Squaring the circle, circling the square
Posted by: QuinB - 08-15-2017, 09:31 PM - Forum: General questions - Replies (11)

Hi all, 
Does anybody happen to have a neat solution to the following problem, please?

I'm trying to take a circular selection and then map it to a rectangular space - rather like this image

[Image: starbucks.png] 
from Squircles' mapping a circle to a square post, in fact.

(And vice versa - what's the point if you can't get yourself back to where you came from?)

I was investigating the Lighting Effects filter's Environment Map section to see if there wasn't a blog post in it, and found that something similar to the operation I'm now interested in is carried out in selecting the source of the environment map to use. Then I found I couldn't duplicate the effect easily to illustrate the concept, even after tinkering with G'MIC's Deformations/Conformal Maps function, which looked like the sort of thing that might do the trick. 

Yes, I could get myself together to understand and write the thing, but I left coding behind a few years ago and I could spend several months teaching myself to Do This Properly in a new language, whereas what I need is to get something written about it sooner than later; if somebody has already invented the wheel (possibly by morphing something square) then it would be of immense help. Can anybody cast some light?

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  Export Layers plugin failed to work on Partha GIMP
Posted by: Reptorian - 08-15-2017, 01:54 PM - Forum: General questions - Replies (1)

I followed instructions, and Export Layers does not exist there. .ora seem to be dropped from that version of GIMP.

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  Scaling and Canvass Size
Posted by: maicart - 08-15-2017, 11:00 AM - Forum: General questions - Replies (2)

Hello,

I have to create a 100x100px icon out of this 640x426px picture (see link below), focusing on the girl's face.

I've been told that first I need to scale the image as closely as possible to 100x100, and then change the canvass size to 100x100.

How can I do it so that I can select just the girl's face, and not her body or surrounding elements? Could you tell me the steps so that I can do this with other pictures?

Thanks.

https://drive.google.com/file/d/0B4_Hyl1...sp=sharing

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  Very new to GIMP and looking to recreate an effect from a YT video.
Posted by: 1840_NO - 08-14-2017, 09:22 PM - Forum: General questions - Replies (4)

https://youtu.be/8qUFyy00Haw?t=660

I've followed this video as well as I could have but my trouble is that when I erase the land lines in GIMP, they don't keep the beveling and embossing effect. I know she's using PS but I feel like there's something I'm overlooking. Is it the "stroke" effect?

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Information Windows Imaging Component (WIC) Plugin
Posted by: Rene Slijkhuis - 08-14-2017, 11:47 AM - Forum: Extending the GIMP - Replies (3)

This new plugin adds reading support for all image formats that are supported by the Windows Imaging Component (WIC) codecs on your computer.

On Windows 10 are by default the following formats supported by this plugin:
.ARW, .BMP, .CR2, .CRW, .DIB, .DNG, .ERF, .GIF, .JPG, .KDC, .MRW, .NEF, .NRW, .ORF, .PEF, PNG, .RAF, .RAW, .RW2, .RWL, .SR2, .SRW, .TIF

To improve the DNG support it’s recommended to install the following DNG codec from Adobe:
DNGCodec_2_0_Installer.exe

On Windows 7 you have to install the following codec pack to get support for the same formats:
Microsoft Camera Codec Pack - http://www.microsoft.com/en-us/download/...x?id=26829

Please note that raw files are automatically converted with the default parameters of the used codec. Use a RAW converter if you want to control the conversion of your images.

Features:

  • The list of supported image formats (in the file open dialog) is based on the registered WIC codecs on your computer. It will automatically be updated when you install new codecs.
  • Some WIC codecs support file formats that can have multiple images in one file. This plugin will open all these images as layers.
Requirements:
  • Microsoft Windows 7 or later
  • GIMP 2.x or later
Download:
WIC_Plugin.zip

Installation:
  • Unzip “WIC_Plugin.zip”
  • Copy all the files into the GIMP “plug-ins” folder
    (which is typically located at: C:\Users\<username>\.gimp-<version>\plug-ins)
    Note: this folder is created on the first startup of GIMP.

[Image: open_image.png]

[Image: procedure_browser.png]

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  "Open Image" change default folder and thumbnail view?
Posted by: Dave001 - 08-14-2017, 02:53 AM - Forum: General questions - Replies (7)

Hi just started using GIMP, and have run into a couple of things that I'm wondering if it's possible to change.

1. Clicking File, Open, brings up the "Open image" window, it always defaults to "Recently Used" and list the last files edited to the right, I'd like it to default to a particular folder. Is this possible?

2. Also in the "Open Image" window, is there a way to have the files shown as thumbnail view instead of list view? Having to click on each file name to see the thumbnail image in the far right of the window is very slow.

Thanks in advance,
Dave

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  Deviations associated with different image processing programs.
Posted by: ajax - 08-13-2017, 07:17 PM - Forum: General questions - Replies (7)

First, let me say that my problem may not be with GIMP but since I'm using and trying to learn GIMP this seemed like the best forum for discussion.  As a result, of some success using GIMP to edit images obtained by scanning old and often decaying photographs I decided to upgrade my camera to something capable of producing images in raw format.  I now have a Canon EOS Rebel T6 set to produce raw images.  I'm running GIMP on Win7 and have installed UFraw Version 0.19.2 in order open the raw image files.

The problem is that there is a huge difference in the picture being displayed depending on what software is being used for viewing it.  When I say view I mean that I have not attempted to do any editing (i.e., make any changes).  I don't know how to demonstrate the problem with raw images that you forum users may not be able to process.  Fortunately, the problem which at present is entirely about appearance is preserved when different software is used to prepare .jpg files for reference purposes.  I've uploaded those .jpg files to Google Photos in order to demonstrate the problem being described.  While Google Photos does perform conversion of it's own, such as scaling, the defects I'm describing are preserved in these images.  For example,

Here (https://goo.gl/photos/sAStoedrd6KEi31cA) is an image prepared by DPP4 (i.e., Canon Digital Photo Professional 4).  Based on the subject of the photograph this one is consistent with photographer's expectation.

Here (https://goo.gl/photos/o81YQcLsxK4XzYJ46)  is the exact same image prepared by GIMP.

When I say same image it means the same raw file converted to .jpg format by the respective software.  Insofar as the raw file has to be processed by UFraw in order for GIMP to obtain an image, it is quite reasonable to conclude that UFraw may have done something to it.  In fact, the process of opening the file in GIMP results in the invocation of UFraw which does display the image prior to forwarding it to GIMP.  The view displayed in UFraw does look like what is is displayed in GIMP and the resulting .jpg created by GIMP.  You might conclude it is obvious that UFraw changed it which in this case amounts to pretty dramatic alteration, especially given that I made no attempt to change anything.

However, that is not the end of story.  I also use Google Picasa for organizing photographs on my computer.  Interestingly, Picasa is able to handle the raw files.  In fact, it looks like Picasa knows how to process them even though Windows does not.  For example,

Here (https://goo.gl/photos/ex25PVZ52eWLF9Ki7)  is the exact same image prepared by Picasa.  Picasa is also the program that is launched when I open a raw file in Windows Explorer.  While, to me, it looks like the .jpg image prepared by Picasa is similar in appearance to the defective one prepared by GIMP they are distinguishable from each other.  However, both of these images appear to have the same defects when compared to what was expected from the actual subject of the photo.  The image prepared by DDP4 is consistent with expectation.  Interestingly when the Picasa viewer is launched it momentarily displays an image that looks much more like the one prepared by DPP4 but it momentarily reverts to the appearance of the referenced image prepared by Picasa (i.e., like casting a dark shadow over the entire image).

My apologies for the verbosity but the big problem here is the extent of the inconsistency in results.  Absent some kind of explanation for what is causing these variations how can one have any confidence in the accuracy of the results obtained from using any of this, or for that matter other, software for editing graphic images.  How can this phenomenon be reconciled?  I hope there is a simple explanation that amounts to my error (i.e., lack of knowledge).  Can anyone explain?

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  Brighten Portion of Image?
Posted by: tspence - 08-12-2017, 12:52 PM - Forum: General questions - Replies (6)

Can't figure out what I'm doing wrong.  Trying to lighten the face of the girl in the attached.  Steps I took:
Duplicate layer.
Use ellipse tool to select face.
Adjust selection as needed (see attached - overbrightened for emphasis).
Use eraser tool - fuzzy brush at 30% or so opacity - to get rid of line between adjusted and non-adjusted part.  Here is where I get unintended results.  Why is the eraser making a white path?  Shouldn't it fill the erased part with the full image underneath?

What am I going wrong?

Thanks!



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  How to wrap paragraph text in an image
Posted by: arun67 - 08-12-2017, 12:50 PM - Forum: General questions - Replies (2)

Hi All,

I'd like to wrap text in an outline based image. So for example, I have some text paragraph :
My house is red - a little house;
A happy child am I.
I laugh and play the whole day long,
I hardly ever cry.

I have a tree, a green, green tree,
To shade me from the sun;
And under it I often sit,
When all my play is done.

And I have an image of heart (outline only).

I want to fir the above text paragraph in the heart image.

Could you please guide me how this can be achieved

regards,
Arun



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