@@ -14,6 +14,7 @@ import (

 	"github.com/docker/docker/api/server/httputils"

 	"github.com/docker/docker/api/types"

 	registrytypes "github.com/docker/docker/api/types/registry"

+	"github.com/docker/docker/errdefs"

 	"github.com/opencontainers/image-spec/specs-go/v1"

 	"github.com/pkg/errors"

 )

@@ -42,9 +43,10 @@ func (s *distributionRouter) getDistributionInfo(ctx context.Context, w http.Res

 	image := vars["name"]

+	// TODO why is reference.ParseAnyReference() / reference.ParseNormalizedNamed() not using the reference.ErrTagInvalidFormat (and so on) errors?

 	ref, err := reference.ParseAnyReference(image)

 	if err != nil {

-		return err

+		return errdefs.InvalidParameter(err)

 	}

 	namedRef, ok := ref.(reference.Named)

 	if !ok {

@@ -52,7 +54,7 @@ func (s *distributionRouter) getDistributionInfo(ctx context.Context, w http.Res

 			// full image ID

 			return errors.Errorf("no manifest found for full image ID")

 		}

-		return errors.Errorf("unknown image reference format: %s", image)

+		return errdefs.InvalidParameter(errors.Errorf("unknown image reference format: %s", image))

 	}

 	distrepo, _, err := s.backend.GetRepository(ctx, namedRef, config)

@@ -66,7 +68,7 @@ func (s *distributionRouter) getDistributionInfo(ctx context.Context, w http.Res

 		taggedRef, ok := namedRef.(reference.NamedTagged)

 		if !ok {

-			return errors.Errorf("image reference not tagged: %s", image)

+			return errdefs.InvalidParameter(errors.Errorf("image reference not tagged: %s", image))

 		}

 		descriptor, err := distrepo.Tags(ctx).Get(ctx, taggedRef.Tag())

@@ -92,6 +94,16 @@ func (s *distributionRouter) getDistributionInfo(ctx context.Context, w http.Res

 	}

 	mnfst, err := mnfstsrvc.Get(ctx, distributionInspect.Descriptor.Digest)

 	if err != nil {

+		switch err {

+		case reference.ErrReferenceInvalidFormat,

+			reference.ErrTagInvalidFormat,

+			reference.ErrDigestInvalidFormat,

+			reference.ErrNameContainsUppercase,

+			reference.ErrNameEmpty,

+			reference.ErrNameTooLong,

+			reference.ErrNameNotCanonical:

+			return errdefs.InvalidParameter(err)

+		}

 		return err

 	}

@@ -92,7 +92,7 @@ func (i *ImageService) GetRepository(ctx context.Context, ref reference.Named, a

 	// get repository info

 	repoInfo, err := i.registryService.ResolveRepository(ref)

 	if err != nil {

-		return nil, false, err

+		return nil, false, errdefs.InvalidParameter(err)

 	}

 	// makes sure name is not empty or `scratch`

 	if err := distribution.ValidateRepoName(repoInfo.Name); err != nil {