[gradsusr] High resolution images problem

[Mark Sponsler]

One other thing I've found with text in printim using .png format: Sometimes there is still some funky thing going on if text size is small such that the text isn't quite as clear/readable as one would expect. 

If you reposition the text just an extra 0.01 inch (or so) left, right or up/down, it becomes much sharper. Just play with it some. 

On June 5, 2015 11:01:02 AM PDT, "Júlio Barboza Chiquetto" <julio22 at gmail.com> wrote:
>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
>>>
>>> _______________________________________________
>>> gradsusr mailing list
>>> gradsusr at gradsusr.org
>>> http://gradsusr.org/mailman/listinfo/gradsusr
>>>
>>>
>>
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>
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Thanks,
Mark Sponsler
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