When I set “_View capture to file” in R9 at 200 it does not import into Photoshop at 200 but at 72 and is much bigger in its linear dimensions. How can I be sure to have the same image size in R9 and Photoshop?
if you scale the resolution in photoshop to 200 dpi, your linear dims should adjust… are they correct once adjusted in photoshop?
Hi,
I set the size in Rhino at 160x125 cm and 200 dpi. I did it in render properties, _Viewport and -Viewport. When the drawing opens in Photoshop the size is 423x352 centimeters and reso at 72. When I change the reso to 200 in Photoshop the linear size remains the same. It seems that in an earlier version of Rhino I was able to get the same dimensions after rendering and sending the image into Photoshop?
Thanks
Joe
@Joe_Neill That sounds like you had “Resample” checked in PhotoShop.
For any digital image only two of the following are independent.
…Number of pixels in each direction (Dimensions in PhotoShop)
…DPI/Resolution
…Width & Height
Once two are given the third is determined.
In PhotoShop if Resample is not checked when Resolution is changed then the number of pixels in each direction stays the same, and the Width and Height are adjusted.
If Resample is checked when Resolution is changed then the Width and Height stay the same and the number pixels is changed. (A new set of pixels with the needed number is created.)
Number of Pixels = Length * DPI
Length = Number of Pixels / DPI
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Thank you. I didn’t pay attention to that. That said, my real question is why doesn’t the rendering in Rhino not translated directly into Photoshop?
Joe
The DPI/PPI setting in an image file is only a tag. It has absolutely no effect on the number of pixels or the RGB values of each pixel.
I used ViewCaptureToFile in both Rhino 8 and Rhino 9 to save the images with 200 dpi using a Windows PC. When I examined the file details the results of both Rhino 8 an Rhino 9 showed 72 dpi, not 200 dpi. No idea why.
Thanks, good to know that all the answers are not yet out there.
it’s possible since your screen is 72 dpi, (might be 96 depending on your monitor) rhino simply make a 72 dpi image that is large enough to account for 200 dpi as you requested.
for instance a 200 dpi image in photoshop at 8”x10” would be 1600 x 2000 pixels.
now if you divide 1600 x 2000 by 72 you get a image inch size of 22.22” x 27.77”
to be clear, these are actually identical sized images in terms of pixels rendered. You simply need to adjust the inch dimension of the pixels…bigger inch size and the dpi will go down from 72… smaller inch sizes and the dpi will go up from 72.
what you want to pay attention to is the actual pixel size of your images that you generate from Rhino.
do the math on the inch dims x the dpi desired and that gives you how many pixels you need at any given size.
my apologies if I’m explaining stuff you already know.
Monitor screen DO NOT have a “dpi” which has any effect on what Rhino does. A monitor screen has a maximum resolution of number of horizontal pixels x number of vertical pixels. Rhino has no idea what the physical size of the monitor screen is and the corresponding pixels per inch. The actual resolution displayed on the monitor screen depends on the setting in the operating system.
The use of “72 dpi” and “300 dpi” to describe image resolution goes way back, to the early 1980s or maybe earlier, and has been causing confusion for almost as long.
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Thanks. No problem, I did not know. I am much more interested in the kind of and quality of my drawings than I am in the purely technical. Even so, that is also interesting.
Best
Joe
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