Photoshop: Photomerge leaves light trails in seems before flattening (expected compositing artifacts because of zoomed out preview)

  • 1
  • Problem
  • Updated 4 years ago
  • Not a Problem
  • (Edited)
Photoshop photomerge in the latest version adds an annoying yellowish trail where it has stitched the photos together (very visible in darker areas). I did a merge with the exact same images in an earlier version and it was perfect. In the newest version it leaves ugly marks all over the panorama in the seems. However, when you zoom into the picture it disappears, but shows up when you zoom out again. When the layers are flattened together this trail also disappears. So the finished product is ok, but it made very concerned when I saw the result of the merge.
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Olav Holten

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Posted 4 years ago

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Chris Cox

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Which version of Photoshop, and you can you show an example of what you are referring to?
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Olav Holten

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Here is the requested info:

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Olav Holten

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Version info:

Adobe Photoshop Version: 14.2.1 (14.2.1 20140207.r.570 2014/02/07:23:00:00) x64
Operating System: Windows 8 64-bit
Version: 6.2
System architecture: Intel CPU Family:6, Model:12, Stepping:3 with MMX, SSE Integer, SSE FP, SSE2, SSE3, SSE4.1, SSE4.2
Physical processor count: 4
Processor speed: 2993 MHz
Built-in memory: 12196 MB
Free memory: 6909 MB
Memory available to Photoshop: 10816 MB
Memory used by Photoshop: 60 %
Image tile size: 1024K
Image cache levels: 4
Font Preview: Medium
TextComposer: Latin
Display: 1
Display Bounds: top=0, left=0, bottom=1050, right=1680
OpenGL Drawing: Enabled.
OpenGL Allow Old GPUs: Not Detected.
OpenGL Drawing Mode: Advanced
OpenGL Allow Normal Mode: True.
OpenGL Allow Advanced Mode: True.
AIFCoreInitialized=1
AIFOGLInitialized=1
OGLContextCreated=1
NumGPUs=1
gpu[0].OGLVersion="3.0"
gpu[0].MemoryMB=3072
gpu[0].RectTextureSize=16384
gpu[0].Renderer="GeForce GTX 660/PCIe/SSE2"
gpu[0].RendererID=4485
gpu[0].Vendor="NVIDIA Corporation"
gpu[0].VendorID=4318
gpu[0].HasNPOTSupport=1
gpu[0].DriverVersion="9.18.13.3165"
gpu[0].Driver="nvd3dumx.dll,nvwgf2umx.dll,nvwgf2umx.dll,nvd3dum,nvwgf2um,nvwgf2um"
gpu[0].DriverDate="20131023000000.000000-000"
gpu[0].CompileProgramGLSL=1
gpu[0].TestFrameBuffer=1
gpu[0].OCLPresent=1
gpu[0].OCLVersion="1.1"
gpu[0].CUDASupported=1
gpu[0].CUDAVersion="6.0.1"
gpu[0].OCLBandwidth=1.08585e+011
gpu[0].glGetString[GL_SHADING_LANGUAGE_VERSION]="4.40 NVIDIA via Cg compiler"
gpu[0].glGetProgramivARB[GL_FRAGMENT_PROGRAM_ARB][GL_MAX_PROGRAM_INSTRUCTIONS_ARB]=[16384]
gpu[0].glGetIntegerv[GL_MAX_TEXTURE_UNITS]=[4]
gpu[0].glGetIntegerv[GL_MAX_COMBINED_TEXTURE_IMAGE_UNITS]=[192]
gpu[0].glGetIntegerv[GL_MAX_VERTEX_TEXTURE_IMAGE_UNITS]=[32]
gpu[0].glGetIntegerv[GL_MAX_TEXTURE_IMAGE_UNITS]=[32]
gpu[0].glGetIntegerv[GL_MAX_DRAW_BUFFERS]=[8]
gpu[0].glGetIntegerv[GL_MAX_VERTEX_UNIFORM_COMPONENTS]=[4096]
gpu[0].glGetIntegerv[GL_MAX_FRAGMENT_UNIFORM_COMPONENTS]=[2048]
gpu[0].glGetIntegerv[GL_MAX_VARYING_FLOATS]=[124]
gpu[0].glGetIntegerv[GL_MAX_VERTEX_ATTRIBS]=[16]
gpu[0].extension[AIF::OGL::GL_ARB_VERTEX_PROGRAM]=1
gpu[0].extension[AIF::OGL::GL_ARB_FRAGMENT_PROGRAM]=1
gpu[0].extension[AIF::OGL::GL_ARB_VERTEX_SHADER]=1
gpu[0].extension[AIF::OGL::GL_ARB_FRAGMENT_SHADER]=1
gpu[0].extension[AIF::OGL::GL_EXT_FRAMEBUFFER_OBJECT]=1
gpu[0].extension[AIF::OGL::GL_ARB_TEXTURE_RECTANGLE]=1
gpu[0].extension[AIF::OGL::GL_ARB_TEXTURE_FLOAT]=1
gpu[0].extension[AIF::OGL::GL_ARB_OCCLUSION_QUERY]=1
gpu[0].extension[AIF::OGL::GL_ARB_VERTEX_BUFFER_OBJECT]=1
gpu[0].extension[AIF::OGL::GL_ARB_SHADER_TEXTURE_LOD]=1
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Chris Cox

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Zoom in to 100%, or flatten the document to see the actual quality. You're seeing edge artifacts because you are zoomed out.
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Olav Holten

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Yes, I am seeing the artefacts because I am zoomed out. As I stated in the error report, that is exactly what is wrong. I can see artefacts that is not actually there. After merging the layers, the seems are not visible. Not even in that zoom level. They should not be visible at all (wysiwyg). It defies logic that a small, small artefact actually is more visible when zoomed out. But if that is the level of excellence you want to achieve, that is up to you...
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Chris Cox

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Yes, they should be visible, because you are looking at a downsampled preview, and downsampling transparent edges that match cannot maintain the matched edges (it's one of these "50% of 50% is not zero" issues).

You are seeing exactly what is expected when zoomed out.
And that issue has existed as long as Photoshop has supported layers.
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Olav Holten

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Well then, I had never seen this before I did this. But if it is a known feature PS then there is not much to do about it. Thank you for your time and effort.

Sincerely
Olav Holten