100% display magnification means "one image pixel equals one screen pixel" — it does not guarantee that 1cm on the canvas will look like 1cm on your screen. Here is how to check true size with Print size and Display Resolution calibration, and when you actually need to.
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What 100% display magnification actually means
Clip Studio Paint's 100% display magnification maps each image pixel to one screen pixel — it does not guarantee that 1cm on the canvas measures 1cm on your monitor. Unless your artwork's resolution (DPI) matches the physical pixel density of the monitor you're using, a 100% view will look larger or smaller than the real object.
- The same 600dpi artwork looks a different physical size at 100% depending on whether your monitor has a low or high pixel density. DPI on the artwork side and physical pixel density on the monitor side are two separate numbers.
- OS display settings can affect physical display size. Browser zoom changes browser content, not the native CSP application’s zoom.
- For work that's only about proportions — composition, panel layout, and similar judgments — 100% is fine as-is. You only need true size for work where the absolute physical size itself changes the outcome.
Calibrating with View menu > Print size and Display Resolution
Clip Studio Paint's View menu includes a Print size option that displays the canvas at the dimensions it will actually print at. It's a separate mode from the pixel-for-pixel 100% view: once you've told the app your monitor's resolution, on-screen length matches what a physical ruler measures. Here is the procedure, confirmed against the official manual:
- Choose Print size from the View menu. The first time you use it, the Display Resolution dialog opens automatically.
- Hold a physical ruler up to your screen. The dialog itself shows ruler tick marks.
- Drag the resolution slider until the dialog's ruler ticks line up with the ticks on the ruler you're holding against the screen.
- Once they match, click OK. From then on, View menu > Print size reproduces that same true-size display.
- Reopen it from Preferences > Canvas > Display Resolution > Settings. Recheck with a physical ruler after switching monitors or OS display settings. Browser zoom does not change calibration in the native CSP application.
How a monitor's physical resolution relates to DPI
An artwork's DPI (pixels per inch) is just information embedded in the file. How large it looks on screen depends on how many ppi (physical pixels per inch) your monitor uses to display those pixels. Unless DPI and ppi match, converting a pixel count straight into millimeters will not give the true on-screen size. Browsers have no direct way to learn a monitor's real ppi, so CSS assumes 96dpi as a convenience when converting mm or inches into pixels. Both the screen ruler tool and the tone preview tool's actual-size preview fall back to this same CSS-96dpi approximation before you calibrate them, and it can drift from your monitor's real ppi.
Read the artwork DPI in Edit > Change image resolution. With Fix pixels enabled, changing only the DPI preserves the pixel dimensions and the size at 100% view. With pixel locking disabled, changes to dimensions or resolution can resample the image, changing the pixel count and visible detail. Document DPI is not monitor calibration.
- Even at the same screen resolution (pixel width), ppi changes with the physical screen size — a smaller screen packs the same pixel count into a smaller area, so ppi rises.
- If an uncalibrated band on the screen ruler tool or tone preview tool looks smaller than the real object, your monitor's ppi is higher than 96; if it looks larger, ppi is lower than 96. Calibrating removes that gap entirely.
The screen ruler tool and tone preview tool's calibration follow the same idea
Both the screen ruler tool and the tone preview tool's actual-size display include an "actual-size (1:1) calibration" setting. You match an on-screen band to a real 100mm on a physical ruler, then save it — the same principle as holding a ruler up to Clip Studio Paint's Display Resolution dialog and adjusting the slider until it matches. Both work around the same limitation, that the software has no way to know your monitor's physical pixel density on its own, by having a person hold up a ruler to supply the missing number.
- The saved calibration value is shared between the screen ruler tool and the tone preview tool. Calibrate in either one and the other picks it up automatically.
- Before calibration, both tools fall back to the CSS 96dpi assumption, which can be off from the real object by roughly 20% on some monitors.
- After changing browser zoom, recalibrate this site’s ruler and tone preview. Their setting is separate from native CSP. After changing monitors or OS scaling, verify physical size in each application you use.
When you actually need to check true size
- Judging how screen tone dots will look. A 60 LPI tone has a dot spacing of only about 0.42mm, so viewing it at ordinary display magnification makes it look coarser or finer than it will at true size — only a true-size view tells you the density it will read as from reading distance.
- Deciding lettering or speech-balloon text size. Font size specified in pt or mm still renders at a different apparent size depending on your monitor's pixel density; only a true-size view shows the size a reader will actually see.
- Checking print-ready files for goods or packaging, where the physical printed size is itself the deliverable.
- Working across inconsistent monitors or display scaling — home versus out, or multiple monitors — when you want to judge size without relying on however it happens to look.
Common questions
Is there work where I don't need Print size display at all?
Yes. For composition, panel layout, and overall balance — anything that only concerns proportions within the picture — the plain 100% view is enough. Checking true size only matters for work where absolute size itself changes the outcome.
What happens if I change browser display scaling after calibrating?
Re-measure the browser tool after changing browser zoom. That change does not affect the native CSP Display Resolution setting; verify CSP separately when changing monitors or OS scaling.
Does this calibration affect the dimensions of a ruler PNG exported from the screen ruler tool?
No. Display calibration does not alter exported pixels or tick spacing. The PNG also records the requested DPI, but scaling on import can still change its size. Verify the resolution and physical dimensions in CSP and compare the 100mm mark after placement.
Sources and verification conditions
Sources checked 2026-09-06. Existing screenshots are from CSP 5.0.4; UI labels can vary by version.