KTX-Software
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Published
20 hours ago •
KhronosGroup
KhronosGroup
toktx: jpeg decoder does not support four-component JPEGs.
Hey,
jpg Images cannot be encoded toktx --t2 --2d --genmipmap --nowarn --resize 512x1024 --bcmp --clevel 1 --qlevel 255 --srgb -- /tmp/gltfpack-DviPtt.ktx2 /tmp/gltfpack-ItLgGo.jpg => 512 tested with latest master from meshoptimizer with toktx master
attached is the image
JPEG images can be encoded.
This .jpg file has 4 components which is not conformant with JFIF or EXIF and not supported by the jpeg decoder I am using, which is the same one as basis_universal. What was this file created with? Photoshop?
What is in the 4th component?
@MarkCallow Hello no idea how this image is created, any other image i tested worked fine some user uploaded this to a server based encoding pipe
TL;DR: The image contains lots of Photoshop-specific data and probably uses CMYK-ish color model.
Here's the output from JPEGsnoop.
JPEGsnoop 1.8.0a by Calvin Hass
http://www.impulseadventure.com/photo/
-------------------------------------
Filename: [94834050-2adc4a80-0410-11eb-8ebb-3d7c69edacb9.jpg]
Filesize: [841093] Bytes
Start Offset: 0x00000000
*** Marker: SOI (xFFD8) ***
OFFSET: 0x00000000
*** Marker: APP13 (xFFED) ***
OFFSET: 0x00000002
Length = 4070
Identifier = [Photoshop 3.0]
8BIM: [0x03ED] Name="" Len=[0x0010] DefinedName="ResolutionInfo structure"
Horizontal resolution = 300 pixels per inch
Width unit = cm
Vertical resolution = 300 pixels per inch
Height unit = cm
8BIM: [0x040D] Name="" Len=[0x0004] DefinedName="Global Angle"
Global Angle = 120 degrees
8BIM: [0x0419] Name="" Len=[0x0004] DefinedName="Global Altitude"
Global Altitude = 30
8BIM: [0x03F3] Name="" Len=[0x0009] DefinedName="Print flags"
Labels = false
Crop marks = false
Color bars = false
Registration marks = false
Negative = false
Flip = false
Interpolate = false
Caption = false
Print flags = true
8BIM: [0x040A] Name="" Len=[0x0001] DefinedName="Copyright flag"
Copyright flag = false
8BIM: [0x2710] Name="" Len=[0x000A] DefinedName="Print flags information"
Version = 1
Center crop marks = 0
Reserved = 0
Bleed width value = 0
Bleed width scale = 2
8BIM: [0x03F5] Name="" Len=[0x0048] DefinedName="Color halftoning information"
Color halftoning information =
| 0x00 2F 66 66 00 01 00 6C 66 66 00 06 00 00 00 00 | ./ff...lff......
| 0x00 01 00 2F 66 66 00 01 00 A1 99 9A 00 06 00 00 | .../ff..........
| 0x00 00 00 01 00 32 00 00 00 01 00 5A 00 00 00 06 | .....2.....Z....
| 0x00 00 00 00 00 01 00 35 00 00 00 01 00 2D 00 00 | .......5.....-..
| 0x00 06 00 00 00 00 00 01 | ........
8BIM: [0x03F8] Name="" Len=[0x0070] DefinedName="Color transfer functions"
Color transfer functions =
| 0x00 00 FF FF FF FF FF FF FF FF FF FF FF FF FF FF | ................
| 0xFF FF FF FF FF FF FF FF 03 E8 00 00 00 00 FF FF | ................
| 0xFF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF | ................
| 0xFF FF FF FF 03 E8 00 00 00 00 FF FF FF FF FF FF | ................
| 0xFF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF | ................
| 0x03 E8 00 00 00 00 FF FF FF FF FF FF FF FF FF FF | ................
| 0xFF FF FF FF FF FF FF FF FF FF FF FF 03 E8 00 00 | ................
8BIM: [0x0400] Name="" Len=[0x0002] DefinedName="Layer state information"
Target layer = 1
8BIM: [0x0402] Name="" Len=[0x0004] DefinedName="Layers group information"
Layer #0:
Layer Group = 0
Layer #1:
Layer Group = 0
8BIM: [0x0408] Name="" Len=[0x0010] DefinedName="Grid and guides information"
Version = 1
Grid Horizontal = 576
Grid Vertical = 576
Number of Guide Resources = 0
8BIM: [0x041E] Name="" Len=[0x0004] DefinedName="URL List"
URL List = | 0x00 00 00 00 | ....
8BIM: [0x041A] Name="" Len=[0x0079] DefinedName="Slices"
Slice Header:
Version = 6
Bound Rect (top) = 0
Bound Rect (left) = 0
Bound Rect (bottom) = 1181
Bound Rect (right) = 572
Name of group of slices = "Ohne Titel-2"
Number of slices = 1
-----
Slice #0:
Slice Resource:
ID = 0
Group ID = 0
Origin = 0
Name = ""
Type = 1
Position (top) = 0
Position (left) = 0
Position (bottom) = 572
Position (right) = 1181
URL = ""
Target = ""
Message = ""
Alt Tag = ""
Cell text is HTML = false
Cell text = ""
Horizontal alignment = 0
Vertical alignment = 0
Alpha color = 0
Red = 0
Green = 0
Blue = 0
-----
8BIM: [0x0411] Name="" Len=[0x0001] DefinedName="ICC Untagged Profile"
ICC Untagged Profile = | 0x01 | .
8BIM: [0x0414] Name="" Len=[0x0004] DefinedName="Document-specific IDs seed number"
Base value = 2
8BIM: [0x040C] Name="" Len=[0x0C05] DefinedName="Thumbnail resources"
Format = 1
Width of thumbnail = 54 pixels
Height of thumbnail = 112 pixels
Widthbytes = 164 bytes
Total size = 18368 bytes
Size after compression = 3049 bytes
Bits per pixel = 24 bits
Number of planes = 1
JFIF data @ 0x00000364
8BIM: [0x0421] Name="" Len=[0x0055] DefinedName="Version Info"
Version = 1
hasRealMergedData = 1
Writer name = "Adobe Photoshop"
Reader name = "Adobe Photoshop 6.0"
File version = 1
8BIM: [0x0406] Name="" Len=[0x0007] DefinedName="JPEG quality"
Photoshop Save As Quality = 12
Photoshop Save Format = "Standard"
Photoshop Save Progressive Scans = "3 Scans"
??? = 1
*** Marker: APP14 (xFFEE) ***
OFFSET: 0x00000FEA
Length = 14
DCTEncodeVersion = 100
APP14Flags0 = 16384
APP14Flags1 = 0
ColorTransform = 2 [YCCK]
*** Marker: DQT (xFFDB) ***
Define a Quantization Table.
OFFSET: 0x00000FFA
Table length = 132
----
Precision=8 bits
Destination ID=0 (Luminance)
DQT, Row #0: 1 1 1 1 1 1 1 1
DQT, Row #1: 1 1 1 1 1 1 1 1
DQT, Row #2: 1 1 1 1 1 1 1 2
DQT, Row #3: 1 1 1 1 1 1 2 2
DQT, Row #4: 1 1 1 1 1 2 2 3
DQT, Row #5: 1 1 1 1 2 2 3 3
DQT, Row #6: 1 1 1 2 2 3 3 3
DQT, Row #7: 1 1 2 2 3 3 3 3
Approx quality factor = 98.25 (scaling=3.50 variance=4.81)
----
Precision=8 bits
Destination ID=1 (Chrominance)
DQT, Row #0: 1 1 1 1 2 3 3 3
DQT, Row #1: 1 1 1 2 3 3 3 3
DQT, Row #2: 1 1 1 3 3 3 3 3
DQT, Row #3: 1 2 3 3 3 3 3 3
DQT, Row #4: 2 3 3 3 3 3 3 3
DQT, Row #5: 3 3 3 3 3 3 3 3
DQT, Row #6: 3 3 3 3 3 3 3 3
DQT, Row #7: 3 3 3 3 3 3 3 3
Approx quality factor = 98.42 (scaling=3.16 variance=0.50)
*** Marker: SOF0 (Baseline DCT) (xFFC0) ***
OFFSET: 0x00001080
Frame header length = 20
Precision = 8
Number of Lines = 1181
Samples per Line = 572
Image Size = 572 x 1181
Raw Image Orientation = Portrait
Number of Img components = 4
Component[1]: ID=0x01, Samp Fac=0x11 (Subsamp 1 x 1), Quant Tbl Sel=0x00 (Y)
Component[2]: ID=0x02, Samp Fac=0x11 (Subsamp 1 x 1), Quant Tbl Sel=0x01 (Cb)
Component[3]: ID=0x03, Samp Fac=0x11 (Subsamp 1 x 1), Quant Tbl Sel=0x01 (Cr)
Component[4]: ID=0x04, Samp Fac=0x11 (Subsamp 1 x 1), Quant Tbl Sel=0x00 (K)
*** Marker: DRI (Restart Interval) (xFFDD) ***
OFFSET: 0x00001096
Length = 4
interval = 72
*** Marker: DHT (Define Huffman Table) (xFFC4) ***
OFFSET: 0x0000109C
Huffman table length = 418
----
Destination ID = 0
Class = 0 (DC / Lossless Table)
Codes of length 01 bits (000 total):
Codes of length 02 bits (000 total):
Codes of length 03 bits (006 total): 07 08 06 05 04 09
Codes of length 04 bits (002 total): 03 0A
Codes of length 05 bits (003 total): 02 01 00
Codes of length 06 bits (001 total): 0B
Codes of length 07 bits (000 total):
Codes of length 08 bits (000 total):
Codes of length 09 bits (000 total):
Codes of length 10 bits (000 total):
Codes of length 11 bits (000 total):
Codes of length 12 bits (000 total):
Codes of length 13 bits (000 total):
Codes of length 14 bits (000 total):
Codes of length 15 bits (000 total):
Codes of length 16 bits (000 total):
Total number of codes: 012
----
Destination ID = 1
Class = 0 (DC / Lossless Table)
Codes of length 01 bits (000 total):
Codes of length 02 bits (000 total):
Codes of length 03 bits (006 total): 06 05 04 03 07 02
Codes of length 04 bits (003 total): 08 01 09
Codes of length 05 bits (001 total): 00
Codes of length 06 bits (001 total): 0A
Codes of length 07 bits (001 total): 0B
Codes of length 08 bits (000 total):
Codes of length 09 bits (000 total):
Codes of length 10 bits (000 total):
Codes of length 11 bits (000 total):
Codes of length 12 bits (000 total):
Codes of length 13 bits (000 total):
Codes of length 14 bits (000 total):
Codes of length 15 bits (000 total):
Codes of length 16 bits (000 total):
Total number of codes: 012
----
Destination ID = 0
Class = 1 (AC Table)
Codes of length 01 bits (000 total):
Codes of length 02 bits (002 total): 01 02
Codes of length 03 bits (001 total): 03
Codes of length 04 bits (003 total): 04 11 05
Codes of length 05 bits (004 total): 12 06 21 07
Codes of length 06 bits (001 total): 13
Codes of length 07 bits (003 total): 22 00 08
Codes of length 08 bits (003 total): 31 14 41
Codes of length 09 bits (002 total): 32 23
Codes of length 10 bits (003 total): 15 09 51
Codes of length 11 bits (003 total): 42 16 61
Codes of length 12 bits (003 total): 24 33 17
Codes of length 13 bits (002 total): 52 71
Codes of length 14 bits (006 total): 81 18 62 91 25 43
Codes of length 15 bits (009 total): A1 B1 F0 26 34 72 0A 19 C1
Codes of length 16 bits (117 total): D1 35 27 E1 53 36 82 F1 92 A2 44 54 73 45 46 37
47 63 28 55 56 57 1A B2 C2 D2 E2 F2 64 83 74 93
84 65 A3 B3 C3 D3 E3 29 38 66 F3 75 2A 39 3A 48
49 4A 58 59 5A 67 68 69 6A 76 77 78 79 7A 85 86
87 88 89 8A 94 95 96 97 98 99 9A A4 A5 A6 A7 A8
A9 AA B4 B5 B6 B7 B8 B9 BA C4 C5 C6 C7 C8 C9 CA
D4 D5 D6 D7 D8 D9 DA E4 E5 E6 E7 E8 E9 EA F4 F5
F6 F7 F8 F9 FA
Total number of codes: 162
----
Destination ID = 1
Class = 1 (AC Table)
Codes of length 01 bits (000 total):
Codes of length 02 bits (002 total): 01 02
Codes of length 03 bits (001 total): 03
Codes of length 04 bits (003 total): 11 04 21
Codes of length 05 bits (002 total): 12 05
Codes of length 06 bits (004 total): 31 06 00 22
Codes of length 07 bits (004 total): 13 41 51 07
Codes of length 08 bits (003 total): 32 61 14
Codes of length 09 bits (005 total): 71 08 42 81 23
Codes of length 10 bits (004 total): 91 15 52 A1
Codes of length 11 bits (004 total): 62 16 33 09
Codes of length 12 bits (004 total): B1 24 C1 D1
Codes of length 13 bits (006 total): 43 72 F0 17 E1 82
Codes of length 14 bits (006 total): 34 25 92 53 18 63
Codes of length 15 bits (005 total): 44 F1 A2 B2 26
Codes of length 16 bits (109 total): 35 19 54 36 45 64 27 0A 73 83 93 46 74 C2 D2 E2
F2 55 65 75 56 37 84 85 A3 B3 C3 D3 E3 F3 29 1A
94 A4 B4 C4 D4 E4 F4 95 A5 B5 C5 D5 E5 F5 28 47
57 66 38 76 86 96 A6 B6 C6 D6 E6 F6 67 77 87 97
A7 B7 C7 D7 E7 F7 48 58 68 78 88 98 A8 B8 C8 D8
E8 F8 39 49 59 69 79 89 99 A9 B9 C9 D9 E9 F9 2A
3A 4A 5A 6A 7A 8A 9A AA BA CA DA EA FA
Total number of codes: 162
*** Marker: SOS (Start of Scan) (xFFDA) ***
OFFSET: 0x00001240
Scan header length = 14
Number of img components = 4
Component[1]: selector=0x01, table=0(DC),0(AC)
Component[2]: selector=0x02, table=1(DC),1(AC)
Component[3]: selector=0x03, table=1(DC),1(AC)
Component[4]: selector=0x04, table=0(DC),0(AC)
Spectral selection = 0 .. 63
Successive approximation = 0x00
NOTE: Scan parsing doesn't support CMYK files yet.
*** Marker: EOI (End of Image) (xFFD9) ***
OFFSET: 0x000CD583
*** Searching Compression Signatures ***
Signature: 01C1158E443D1C90F302FF6BE49DDD87
Signature (Rotated): 01C1158E443D1C90F302FF6BE49DDD87
File Offset: 0 bytes
Chroma subsampling: ?x?
EXIF Make/Model: NONE
EXIF Makernotes: NONE
EXIF Software: NONE
Searching Compression Signatures: (3347 built-in, 0 user(*) )
EXIF.Make / Software EXIF.Model Quality Subsamp Match?
------------------------- ----------------------------------- ---------------- --------------
SW :[Adobe Photoshop ] [Save As 12 ]
NOTE: Photoshop IRB detected
Based on the analysis of compression characteristics and EXIF metadata:
ASSESSMENT: Class 1 - Image is processed/edited
@MarkCallow We may need to give meaningful warnings on JPEG inputs with complex color space metadata.
A few highlights:
- JFIF files (identified by APP0 with JFIF tag) are either grayscale or YCbCr. They may optionally contain an ICC profile in APP2.
- EXIF files (identified by APP2 with EXIF tag) can contain so many configurations that correctly handling all (or even most) of them certainly requires a dedicated software package.
- Adobe files (identified by APP13 and APP14 tags) contain extra metadata on how the image was produced. The interesting bit here is the
ColorTransformflag inside APP14. YCCK means that the fourth component contains black values to restore the original CMYK image. It could be safely ignored by libKTX.