Hello. I executed test. and run "exiftool" for each image files.
The following fields I was concerned about seem to be determined based on the resized image, as expected, rather than the Exif value of the original image. - Orientation: copy from *original* image. - Image Width: based on *resized* image. - Image Height: based on *resized* image. - Y Cb Cr Sub Sampling: based on *resized* image. I thought my concern was unnecessary. My question is solved. Regards.
ExifTool Version Number : 12.49 File Name : original.jpg Directory : . File Size : 139 kB Zone Identifier : Exists File Modification Date/Time : 2022:10:27 12:12:46+09:00 File Access Date/Time : 2022:10:27 12:57:16+09:00 File Creation Date/Time : 2022:10:27 12:54:07+09:00 File Permissions : -rw-rw-rw- File Type : JPEG File Type Extension : jpg MIME Type : image/jpeg Exif Byte Order : Little-endian (Intel, II) Orientation : Horizontal (normal) X Resolution : 72 Y Resolution : 72 Resolution Unit : inches Y Cb Cr Positioning : Centered Quality : 70% XMP Toolkit : Adobe XMP Core 5.0-c060 61.134777, 2010/02/12-17:32:00 Original Document ID : xmp.did:048011740720681185DFA072021BDFE6 Document ID : xmp.did:192571C8CED511E1B1C1DA012E36D12B Instance ID : xmp.iid:44CDC084CED311E1B1C1DA012E36D12B Creator Tool : Adobe Photoshop CS5 Macintosh Derived From Instance ID : xmp.iid:854147ED0A20681185DFA072021BDFE6 Derived From Document ID : xmp.did:048011740720681185DFA072021BDFE6 Current IPTC Digest : fce11f89c8b7c9782f346234075877eb Coded Character Set : UTF8 Application Record Version : 2 IPTC Digest : fce11f89c8b7c9782f346234075877eb DCT Encode Version : 100 APP14 Flags 0 : [14], Encoded with Blend=1 downsampling APP14 Flags 1 : (none) Color Transform : YCbCr Image Width : 600 Image Height : 450 Encoding Process : Baseline DCT, Huffman coding Bits Per Sample : 8 Color Components : 3 Y Cb Cr Sub Sampling : YCbCr4:4:4 (1 1) Image Size : 600x450 Megapixels : 0.270
ExifTool Version Number : 12.49 File Name : resized.jpg Directory : . File Size : 20 kB File Modification Date/Time : 2022:10:27 12:57:17+09:00 File Access Date/Time : 2022:10:27 12:57:18+09:00 File Creation Date/Time : 2022:10:27 12:57:17+09:00 File Permissions : -rw-rw-rw- File Type : JPEG File Type Extension : jpg MIME Type : image/jpeg JFIF Version : 1.02 Resolution Unit : None X Resolution : 1 Y Resolution : 1 Image Width : 300 Image Height : 225 Encoding Process : Baseline DCT, Huffman coding Bits Per Sample : 8 Color Components : 3 Y Cb Cr Sub Sampling : YCbCr4:2:0 (2 2) Image Size : 300x225 Megapixels : 0.068
ExifTool Version Number : 12.49 File Name : exif-updated.jpg Directory : . File Size : 20 kB File Modification Date/Time : 2022:10:27 12:57:17+09:00 File Access Date/Time : 2022:10:27 12:57:52+09:00 File Creation Date/Time : 2022:10:27 12:57:17+09:00 File Permissions : -rw-rw-rw- File Type : JPEG File Type Extension : jpg MIME Type : image/jpeg JFIF Version : 1.02 Exif Byte Order : Little-endian (Intel, II) Orientation : Horizontal (normal) X Resolution : 72 Y Resolution : 72 Resolution Unit : inches Y Cb Cr Positioning : Centered Image Width : 300 Image Height : 225 Encoding Process : Baseline DCT, Huffman coding Bits Per Sample : 8 Color Components : 3 Y Cb Cr Sub Sampling : YCbCr4:2:0 (2 2) Image Size : 300x225 Megapixels : 0.068
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