On Fri, Jan 13, 2017 at 12:23 PM, David Carlisle <[email protected]> wrote: > Further to my last mail, I just tried the same test file with > latex+dvipdfmx and it works like pdftex (the clipping is tight to the > numbered circles) but I get the warning > > > extractbb:warning: JPEG: Inconsistent resolution may have specified in > Exif and JFIF: 72x72 - 120x120 > > So arguably it's a fault in the image file, (and not your fault:-) > although given that it's easy to produce such things and hard to spot > in advance, it would perhaps be good if things could go the same way > or error or at least warn... > > In this case I just drew a couple of circles in an empty microsoft > paint and clicked save as jpeg, so it's not as if the inconsistent > data occurred due to some complicated pipeline of image > transformations. > > > David
It should be fixed now in experimental, but in any case it's different from pdftex. If there is an EXIF tag then we set the resolution from there assuming a default of 72 pixel per inch, and this take the precedence over the JFIF data. Otherwise we take the JFIF data. In case of clip-1-2.jpg there is at least one EXIF tag, so we start with the default resolution of 72dpi and we keep it, because there is no tags about resolution : $ exiftool -a -u clip-1-2.jpg ExifTool Version Number : 10.10 File Name : clip-1-2.jpg Directory : . File Size : 12 kB File Modification Date/Time : 2017:01:12 14:58:28+01:00 File Access Date/Time : 2017:01:12 14:58:28+01:00 File Inode Change Date/Time : 2017:01:12 14:58:49+01:00 File Permissions : rw-rw-r-- File Type : JPEG File Type Extension : jpg MIME Type : image/jpeg JFIF Version : 1.01 Resolution Unit : inches X Resolution : 120 Y Resolution : 120 Exif Byte Order : Big-endian (Motorola, MM) Exif 0x0301 : 2.199978 Exif 0x0303 : 0 Exif 0x5110 : 1 Exif 0x5111 : 4724 Exif 0x5112 : 4724 Image Width : 243 Image Height : 214 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 : 243x214 Megapixels : 0.052 From https://msdn.microsoft.com/en-us/library/ms932271.aspx PropertyTagPixelPerUnitX Pixels per unit in the x direction. Tag 0x5111 Type PropertyTagTypeLong Count 1 PropertyTagPixelPerUnitY Pixels per unit in the y direction. Tag 0x5112 Type PropertyTagTypeLong Count 1 PropertyTagPixelUnit Unit for PropertyTagPixelPerUnitX and PropertyTagPixelPerUnitY. A setting of 0 indicates that property is unknown. Tag 0x5110 Type PropertyTagTypeByte Count 1 but these tags does not affect the resolution. So in luatex we have a width of 243pixels at 72dpi, hence 243.91125pt. On the other side pdftex takes the other way, so we have 243pixels at 120dpi, hence 146.34676pt. -- luigi
