[gradsusr] High resolution images problem

[Júlio Barboza Chiquetto]

Hello Eric,
thanks so much for the valuable feedback!
Best regards,

Júlio B. Chiquetto,

Doutorando em Climatologia
USP - Geografia Física

PhD Student in Climatology
University of Sao Paulo - Physical Geography

On 5 June 2015 at 14:16, Eric Altshuler <ela at cola.iges.org> wrote:

> 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
>
>
> ------------------------------
> *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:
>>
>>> 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
>>>
>>> _______________________________________________
>>> gradsusr mailing list
>>> gradsusr at gradsusr.org
>>> http://gradsusr.org/mailman/listinfo/gradsusr
>>>
>>>
>>
>>
>> --
>> Jeff Duda
>> Graduate research assistant
>> University of Oklahoma School of Meteorology
>> Center for Analysis and Prediction of Storms
>>
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>>
>>
>
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