Graphic file formatsx

[Murat Yildizoglu]

This is not a problem of the text content.

 When you create a points plot in R, it puts the information about all the points in the exported PDF figure, even if many of them correspond to the same coordinates. It does not « flatten » the pdf figure. When you plot millions of points, that results in a lot of information and may necessitate considerable amount of memory from the computer for displaying on the screen or from the printer, to transfer on paper. 
When we export to a bitmap format like PNG, the information is « flattened » and all points that fall on the same pixels are coded just the value of these pixels. That makes the figure easier to handle. 

When you do a curve plot (like a density plot, for example) this problem does not exist. This is another strategy that I  use when possible: can I show the same informed with a curve instead of with dots? If yes, I go for it. It is much more parsimonious. 

Using a bitmap format with correct proportions and sufficient density, the first solution gives very satisfactory results even if the figures are bitmaps. 

--

Prof. Murat Yildizoglu


> Le 9 déc. 2021 à 00:37, Steve Litt <slitt at troubleshooters.com> a écrit :
> 
> Rich Shepard said on Wed, 8 Dec 2021 07:51:56 -0800 (PST)
> 
>> On Wed, 8 Dec 2021, Dr Eberhard Lisse wrote:
> 
>>> For my big handbook (which takes 110 seconds to compile (70 on the
>>> M1)) I have split this into child documents which compile
>>> individually within 10 to 15 seconds.  
>> 
>> How about loading a PDF image that's 3,704,503 bytes in size while
>> reading your big handbook?
> 
> OK, 3,704,503 bytes got my attention. No wonder it's slow.
> 
> There are ways to shrink PDF size:
> 
> Web search: linux shrink pdf size
> 
> SteveT
> 
> Steve Litt 
> Spring 2021 featured book: Troubleshooting Techniques of the Successful
> Technologist http://www.troubleshooters.com/techniques
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