Matlab gamma correction when opening and writing files -


I am using matlab to do some calculation on images, and my first impression was that after reading one The value stored in matlab matrix was a gamma right from a JPEG file, so, I should write the following code: 

  im = (double (('Myim. jpg'))) / 255) ^ 2.2;   
 To obtain a matrix with values ​​in linear space. However, I tried the following: Generate a linear shield:  
  X = 1: 256 shield (:, x) = ones (128,1) * (x-1) / 255 for; End   
 Then I write it in jpeg file and read it again:  
  imwrite (gradient, 'gradient.jpg', 'quality' , 100); gradient_jpg = double (imed ('gradient.jpg')) / 255;   
 Now I expect the gradient and gradient_jpeg to be isolated, because as it was written as a JPG file and the second was not there, the latter gamma was correct. Both matrix exits I and I am the place where I do not understand. In the last test, I tried to open the same JPG image from Matlab and HDRops. Both images are shown on the same screen, but when I look at the values ​​in the images, they are not the value of values ​​in matlab I get in the HDR on the power of 2.2 (roughly). So my question is ... when a JPEG file reads, or I have,  
 thanks in advance   
 
 
 This is a good question. I'm here for the same reason.  
 In the document to write, I do not see any option for gamma correction, and it is silent on the whole issue.  
 I get the same value in the matrix, which I read from the screen (using imshow using a color checker utility) and on the screen I see, they are very close (but not at all) What do I see in the app to see other images.  
 So I'm not sure S is an answer, but there is more information in it.

Comments

Post a Comment

Popular posts from this blog

c# - ASP.NET MVC - Attaching an entity of type 'MODELNAME' failed because another entity of the same type already has the same primary key value -

In brief, the wrapper module is inserted during posting and the status of an entry is changed to 'modified' . Before changing the state, the state is set to 'separate', but calling attachments () causes the same error to be thrown away. I am using EF 6. Model / wrapper class public class avi model {public A is a {get; Set; } Public listing & lt; B & gt; B {received; Set; } Public cc {receipt; Set; }} Administrator edit public functioning (int? id) {if (id == null) {new HttpStatusCodeResult (HttpStatusCode.BadRequest); } If (! Conveyor Access (id.Value)) new HTTPTitus code result (HTTP status code. Forbidden); Var aViewModel = new AViewModel (); aViewModel.A = db.As.Find (id); If (aViewModel.Receipt == zero) {return HttpNotFound (); } aViewModel.b = db.Bs.Where (x => x.aid == id.Value) .Oolist (); AViewModel.Vendor = db.Cs.Where (x => x.cid == aViewModel.a.cID) .FirstOrDefault (); See Return (aViewModel); } [HTPFost] [Valid AntitiferousTeacon...
Read more

jasper reports - How to center align barcode using jasperreports and barcode4j -

I use iReport 5.5.0 . How to align a barcode component to the center The relevant piece of my jrxml is below & Lt; JR: Code 128 xmlns: JR = "http://jasperreports.sourceforge.net/jasperreports/components" xsi: schemaLocation = "http://jasperreports.sourceforge.net/jasperreports/components http: //jasperreports.sourceforge Purge / xsd / components.xsd "textPosition =" bottom "& gt; & Lt; Jr: codeExpression & gt; & Lt; [CDATA [$ F {number}]] & gt; & Lt; / Jr: codeExpression & gt; & Lt; / Jr: Code 128 & gt; & Lt; / componentElement & gt; "Text" itemprop = "text"> Create a style after this, it is called "barcode", like: & lt; Style name = "barcode" fontName = "Helvetica" fONTSIZE = "10" hAlign = "center" valign = "center" /> and set the property of your barcode element to "barcode".
Read more

django - CommandError: You must set settings.ALLOWED_HOSTS if DEBUG is False -

I use Django 1.6.5 with settings in my program txsite: DEBUG = true I set the lie to debug, but when I get the runner , I get the following error: CommandError: You have to set the settings. OLOWOWHESTS If DEBUG is False I ALLOWED_HOSTS = ['127.0.0.1', 'localhost'] but I get the same error. Does anyone know this address? Try ALLOWED_HOSTS = ['*'] Less secure If you are not on a firewall or public LAN, but what I use and it works. Edit: Interestingly enough, I have to add some of my 1.8 projects, even if DEBUG = True . Why so very uncertain
Read more