x/image/tiff: compressed tiffs are invalid (at least on Mac OS X)

[cantino]

Please answer these questions before submitting your issue. Thanks!

What version of Go are you using (go version)?

go version go1.10.3 darwin/amd64

Does this issue reproduce with the latest release?

I'm on go1.10.

What operating system and processor architecture are you using (go env)?

GOARCH="amd64"
GOBIN=""
GOCACHE="/Users/xxx/Library/Caches/go-build"
GOEXE=""
GOHOSTARCH="amd64"
GOHOSTOS="darwin"
GOOS="darwin"
GOPATH="/Users/xxx/projects/go"
GORACE=""
GOROOT="/usr/local/opt/go/libexec"
GOTMPDIR=""
GOTOOLDIR="/usr/local/opt/go/libexec/pkg/tool/darwin_amd64"
GCCGO="gccgo"
CC="clang"
CXX="clang++"
CGO_ENABLED="1"
CGO_CFLAGS="-g -O2"
CGO_CPPFLAGS=""
CGO_CXXFLAGS="-g -O2"
CGO_FFLAGS="-g -O2"
CGO_LDFLAGS="-g -O2"
PKG_CONFIG="pkg-config"
GOGCCFLAGS="-fPIC -m64 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -fdebug-prefix-map=/var/folders/kc/_mt5mw0j5ksfg846hgllc5lr0000gn/T/go-build015281372=/tmp/go-build -gno-record-gcc-switches -fno-common"

What did you do?

Here is a reproduction case.

What did you expect to see?

A valid white tiff.

What did you see instead?

A system error.

Works for me on linux. Perhaps Mac OS X doesn't support TIFF compression?

[ianlancetaylor]

CC @nigeltao

[cantino]

OS X can definitely support Deflate, at least in some contexts. This issue may have something to do with pixel count. When I set width, height := 2104, 2736 (half the width, same height), the resulting compressed file works fine.

[prl900]

I'm wondering if this is related to #24657. The issue was resolved for Gray16 images but I've just realised other types (including RGBA64), will have the same problem. Although this issue affects the decoding functionality there might be a similar problem affecting the encoding part.

As background, the problem that I'm referring to appears when the internal tile defined in a tiff does not align evenly with the total size of the image. If not related, I'll open a new issue to fix this one.

[cantino]

@prl900 did you ever investigate this? I'm hoping to use golang to generate tiffs, but currently cannot due to this issue.

[prl900]

I think the problem you are experiencing is related with the encodeRGBA64 whereas the problem that I previously commented was related to the decoding functions.

Regardless, I've run your code on my mac (OS mojave) and I can open both tiffs (compressed and non-compressed) with Preview.

Happy to help to find out what the problem might be.