[gradsusr] High resolution images problem

[Eric Altshuler]

Hello Julio, 


I would also suggest you use PNG (the default image format for printim) or GIF. Both of these formats use lossless compression. JPG is lossy, and is intended for images with many colors (thousands or more) and without text or sharp borders between colors. When zooming in on the high resolution image, significant distortion is present. Since your images have a small number of colors, text, and abrupt transitions between colors, you should use PNG or GIF. JPG does not handle this type of image well. 


Best regards, 


Eric L. Altshuler 
Research Scientist 
Center for Ocean-Land-Atmosphere Studies 
253 Research Hall, Mail Stop 6C5 
George Mason University 
4400 University Drive 
Fairfax, VA 22030 USA 

E-mail: ela at cola.iges.org 
Phone: (703) 993-5725 
Fax: (703) 993-5770 

----- Original Message -----
From: "Júlio Barboza Chiquetto" <julio22 at gmail.com> 
To: "GrADS Users Forum" <gradsusr at gradsusr.org> 
Sent: Thursday, June 4, 2015 11:39:27 PM 
Subject: Re: [gradsusr] High resolution images problem 


Jeff, 
thank you for clarifying, I will follow your suggestion then. 
Kind regards, 





Júlio B. Chiquetto, 


Doutorando em Climatologia 
USP - Geografia Física 



PhD Student in Climatology 
University of Sao Paulo - Physical Geography 

On 4 June 2015 at 23:20, Jeff Duda < jeffduda319 at gmail.com > wrote: 




I think the number of pixels used for fonts scales differently with changing image size. Just increase the font thickness and/or size to improve readability. 

Jeff Duda 



On Thu, Jun 4, 2015 at 5:59 PM, Júlio Barboza Chiquetto < julio22 at gmail.com > wrote: 

<blockquote>




Hello all, 
I've had some problems generating high-resolution images with printim (I am using version 2.0). 
It seems that, with, a white background, the text gets somehow fainter. 
The more pixels I used in the commands, the more the text faded. 
For these images I used: 
printim image1.jpg x5000 y5000 white 
printim image2.jpg x500 y500 white 



For image 2, I used 10x less pixels but the text is much clearer to read. 
There must be something obvious I am missing here, but I am afraid I don't know much about digital images. 


I suppose I could change x and y axis fonts thickness and size, but I am not sure it would work. 
Anyway, I don't understand why this happens and am looking for a reasonable solution. 


Kind regards, 


Júlio B. Chiquetto, 






Doutorando em Climatologia 
USP - Geografia Física 



PhD Student in Climatology 
University of Sao Paulo - Physical Geography 
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-- 

Jeff Duda 
Graduate research assistant 
University of Oklahoma School of Meteorology 
Center for Analysis and Prediction of Storms 

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</blockquote>


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