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 Post subject: Document scale factor
PostPosted: Wed Oct 23, 2013 5:55 pm 
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Joined: Fri Sep 20, 2013 12:06 am
Posts: 8
We are using a 1/10 scale for most of our templates and it is working fine for the font sizes but it doesn't affect the minimum PPI we have set.
For example if we are using a 1/10 scale and we want a minimum of 72 PPI, we found that we need to set the minimum PPI to 720 for it to work correctly at the 1/10 scale.
Is this by design or a bug? Just want to know if we use 720 PPI for all our templates it is not going to change in the future.


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PostPosted: Wed Oct 23, 2013 9:17 pm 
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Joined: Sun Aug 11, 2013 8:11 pm
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Location: Massachusetts, USA
Hi Matt,

The minimum resolution applies to the size your template is using. The assumption is that your template is full-size and if you are scaling the output later you need to factor that into the sizes of placed images, so in order to get a 72 ppi effective resolution after blowing up the PDF 10 times it makes sense you need to start with 720 ppi when you place the image.


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PostPosted: Thu Oct 24, 2013 1:01 am 
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Joined: Fri Sep 20, 2013 12:06 am
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Most of our printed products that we will be using PrintUI for are very large 10 to 20+ feet in height and/or width.
Is scaling our templates the best approach for this scenario? PrintUI seems to initialize better when the templates are designed at 1/10th scale rather than full size. And also the font size selector works better at 1/10. (at full scale the max slider position is too small and the user would need to type in a larger size which isn't user friendly)

It just seemed a little odd to set the minimum resolution to 720. It seemed that the scale factor should affect the minimum resolution in the same way that it adjusts the font sizes.
Is the font size the only thing that the scale factor affects? Is there any way to have the requestdoc api output the file at full size based on the scale factor? If not, is there any way for the person processing the job to see that a scale factor was set when they get the idml file at the pre press? Or do we need to create our own method for indicating the scale at the time of printing.


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PostPosted: Thu Oct 24, 2013 10:20 am 
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Joined: Sun Aug 11, 2013 8:11 pm
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Location: Massachusetts, USA
Scaling is affecting the images and the fonts the same way. Fonts are vector art, which is a mathematical formula that describes the shape, and can be scaled up or down without distortion, so if your template is 1/10 scale and you choose a font size of 48 pts. the 10x output is 480 pt type, but because it is vector it remains smooth.

Images, on the other hand, are grids of pixels, or blocks of color. As you increase the scale those blocks are enlarged by the scaling factor. When they get large enough the individual blocks that make up your image become visible to the naked eye.

Sandee Cohen likes to think of images a being like a tile floor, with the resolution changing the size of the tiles. I prefer to think about balloons. If you were to draw a checkerboard on a balloon, then inflate the balloon, the squares will get larger and larger, but they don't move apart. This is the equivalent of scaling up and reducing the resolution, which are in reverse proportion to one another.

Images look smooth to us as long as the the pixels are small enough that we can't pick them out. There is not an absolute value for this, but rather it depends on the viewing distance. For a typical magazine or similar page that will be viewed at about arms' length, 300 ppi is usually considered about right, but if you tack that page to the wall and walk across the room you won't be able to make out any fine details because the pixels are too small. For long-distance viewing you need larger pixels, or lower resolution. There's a pretty good discussion and formula for calculating the optimal resolution at http://forums.adobe.com/message/2042202#2042202.

For large output it makes a lot of sense to work at smaller scale, as you are doing. ID and Acrobat both have document size limits (Acrobat's are a bit smaller than ID's, 96" if I remember right), so it's often the only way to produce the file. You just have to remember that everything will be blown up, so if you will design at 1/10, you need 10 times the resolution in the template and PDF as you need in the print after scaling.


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