Designed for the most demanding needs of photographers and videographers.
877-865-7002
Today’s Deal Zone Items... Handpicked deals...
$5999 $4399
SAVE $1600

$999 $849
SAVE $150

$2599 $2099
SAVE $500

$1149 $949
SAVE $200

$2299 $1849
SAVE $450

$1049 $879
SAVE $170

$899 $749
SAVE $150

$1099 $1099
SAVE $click

$680 $680
SAVE $click

$398 $328
SAVE $70

$348 $248
SAVE $100

$999 $699
SAVE $300

$5999 $4399
SAVE $1600

$4499 $3499
SAVE $1000

$999 $799
SAVE $200

$799 $699
SAVE $100

$1199 $899
SAVE $300

$1099 $849
SAVE $250

$348 $248
SAVE $100

$1601 $998
SAVE $603

$3399 $2999
SAVE $400

$3997 $3697
SAVE $300

$5999 $4399
SAVE $1600

$3399 $2999
SAVE $400

Photoshop Scaling Bug

Order NEC PA322UHD with calibration software and calibrator unit
Order NEC PA322UHD WITHOUT software/hardware calibration
XRite i1 Display Pro | SpectraView II software

Tested with Photoshop CC 2014 version 20141014 r.257 using OS X Yosemite 10.10.1.

For this discussion, “actual pixels” means 100% scale meaning one image pixel is drawn to one screen pixel. 50% means two image pixels are drawn in one screen pixel, 200% means one image pixel is drawn on 2 screen pixels, etc.

This is all independent of display scaling; display scaling is designed to affect only text and user interface elements.

These issues are fixed in Photoshop CC 2015.

What follows applies to any brand HiDPI or 4K display (not specific to NEC or other brand).

Photoshop CC does not scale images properly on HiDPI screens. Bug reproduced on these combinations:

But the error also occurs on retina display of the MacBook Pro Retina, showing that it is a general problem not confined to 4K UltraHD displays.

The amount of error varies, but sometimes it is as much as 2:1, e.g., 100% pixels is really 50% pixels, so one has to zoom to 200% to see 100%! The error occurs regardless of the display scaling settings, and can come and go—sometimes right and sometimes wrong. Your author suspects a new bug in OS X Yosemite 10.10, not having observed this issue prior. But it might be Photoshop itself (only).

Example 1

As shown below, Photoshop is supposed to be displaying at 100% pixels (see very lower left where Photoshop itself shows this scaling) an image of dimensions 5754 X 3200. Yet as the ruler shows, over 5000 pixels are drawn on a screen that is only 3840 wide! Obviously this is not actual pixels! It’s about 75% of actual pixels (~5404 pixels drawn in a 3840 width).

Click for full-res screen image (3840 X 2160).

Photoshop CC 2014: incorrect image scaling

Example 2

The example below makes it painfully clear: the image being displayed is itself 3840 pixels wide (and indeed the ruler matches that), so it should fill the 3840-wide screen at 100% pixels (actual pixels).

Yet Photoshop has drawn it half-size, 1920 pixels wide, which is 50% scale.

Click for full-res screen image (3840 X 2160).

Photoshop CC 2014: incorrect image scaling


View all handpicked deals...

Voigtlander MACRO APO-LANTHAR 65mm f/2 Aspherical Lens for Sony E
$999 $849
SAVE $150

diglloyd Inc. | FTC Disclosure | PRIVACY POLICY | Trademarks | Terms of Use
Contact | About Lloyd Chambers | Consulting | Photo Tours
RSS Feeds | X.com/diglloyd
Copyright © 2022 diglloyd Inc, all rights reserved.